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Re: Making your own Fiberglass Parts [Re: STEFF] #2606988
01/15/19 04:02 PM
01/15/19 04:02 PM
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Originally Posted By STEFF
Originally Posted By JERICOGTX
Originally Posted By STEFF
Originally Posted By JERICOGTX
STEF, here is a write up from Jay Brown, a friend of mine, and HEMI Joel's, on how he made a mold for his Shelby bumpers. I did the finish sanding and paint on these, and they turned up very nice.

http://fepower.net/simplemachinesforum/index.php?topic=3783.0



Extremely Helpful!! Thanx Jeff!!

On a side note, I read some posts on Speedtalk your Buddy posted when he made Rockers for his motor. Very Cool Car!!


He is making his own Cylinder heads, rockers, intakes, valve covers, and a few other things. Very smart guy, and not sure where he gets his ambition.


That was a SOHC motor, correct?


Wedge stuff, but he does make his own SOHC rockers now also.


69 GTX 68 Road Runner
Re: Making your own Fiberglass Parts [Re: JERICOGTX] #2607003
01/15/19 04:34 PM
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Originally Posted By JERICOGTX
Originally Posted By Doc Fiberglass
200$ for shipping is uNsane ! Someone at unlimited didn’t figure that out correctly. Each bumper should ship as though they were 25 pounds each.!PLUS I’ll bet you could send them by TRUCK FREIGHT (terminal to terminal)!for about that kind of money


Another fiberglass thread, and Doc thinks it's still 1982... He can build it better, cheaper, and ship it for next to nothing, but never does.


jX ..,, BITE ME ! ...,

and I said NOTHING OF THE SORT. And as far as shipping - show me where I’m wrong.

Re: Making your own Fiberglass Parts [Re: STEFF] #2607007
01/15/19 04:44 PM
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It's ship by volume, more than weight. Big boxes take up room in the trucks, and usually are in the way for most of the ride. That is why the extra charge. weight has nothing to do with it.


69 GTX 68 Road Runner
Re: Making your own Fiberglass Parts [Re: partsforsale] #2607008
01/15/19 04:45 PM
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Originally Posted By partsforsale
Originally Posted By STEFF
Originally Posted By Doc Fiberglass
work ....

Verrry interesting ! biggrin


I know you are the master at this. Care to divulge any tips?


My thoughts exactly.


BBL ... I’ll touch base on a few tips

Re: Making your own Fiberglass Parts [Re: JERICOGTX] #2607009
01/15/19 04:50 PM
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Originally Posted By JERICOGTX
It's ship by volume, more than weight. Big boxes take up room in the trucks, and usually are in the way for most of the ride. That is why the extra charge. weight has nothing to do with it.


That’s EXACTLY what I said ( in a roundabout way) that box and bumper ACTUALLY weighs maybe 8 pounds and costs as though it weighs 25 lbs. UPS and fedex maybe have fiddled with those specs a bit but it’s in the ballpark

Re: Making your own Fiberglass Parts [Re: STEFF] #2607011
01/15/19 04:53 PM
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Oooops ... TO ADD ... truck freight - you’ve got to know how to get the best rate !

TRUCKERS love TOP FREIGHT!

Re: Making your own Fiberglass Parts [Re: dIc dOc Deity !] #2607277
01/16/19 12:20 AM
01/16/19 12:20 AM
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Good advice so far. Basically, make the surface of the plug as smooth as possible. If need be spray a coat of primer on it and sand it to a fine finish.

Determine if the mould can be one piece or not.
Wax the plug. Then wax it again. Go have rum or two. Come back, wax it again. Roll or spray on some PVA. The beauty of PVA is it is water soluble. If the mould or part is sticking work in some water and it will dissolve the PVA allowing release.

Lay out the plug formerly known as a bumper so it is level in a couple of planes.

If it is a one piece mould, start laying up a couple of layers of mat using polyester resin as it is cheap. The mat will conform to pretty much any shape. You can, if desired, use tooling gelcoat over the plug as a first coat. This gives a nice finished surface to the mould. Otherwise, lay up some more layers of glass. To build up thickness throw in some roving with the roving. Mat and roving are the cheapest glass out there. Remember thickness is your friend to make the mould stiff. If a two piece mould figure out where the seam will be located.

After the mould has cured, tab on a grid to the backside. Plywood laid out in an eggcrate fashion works great. I like to make sure the grid pieces are level as when the mould comes off the plug you can set it up on some saw horses or a work bench and if it lies level you know the bumper is not twisted.
Wax the mould again. Keep waxing. Open next bottle of rum while waiting for wax to cure. Wax again. Spray or roll in some PVA.

Next, decide what fibre you want to use. Glass or Carbon? Carbon is much stiffer. Also much more expensive. Will you want to add core? Core adds lots of stiffness at minimal weight. Coremat is an inexpensive although heavy alternative to foam, balsa or honeycomb. Still lighter than solid glass, it comes in 2-4mm thicknesses. Remember for it to function as a core it must be between the inner and outer skins.

Start laying up material in mould, wetting it out on a table with plastic over it. Squeegee out the excess resin. Ideally use epoxy as it has better properties. Add a few layers. Throw on some peelply. Work the peel ply into the mould using a laminate roller. Snip as required to make it fit at inside corners. Throw some bleeder cloth over the peel ply. Then put a vacuum bag over the whole mess. Run vacuum tube under bag, making sure it is over the bleeder cloth. Turn on vacuum pump. Chase leaks. When leaks hunted down and killed, let vacuum pump run until part cured. Finish rum bottle.

Remove vacuum bag, bleeder cloth and peel ply. Using a wedge, pop part out of mould. Wash PVA off with soap and water. Spray with a coat of primer. Finish to level desired. I work with epoxy so never use gelcoat. Gelcoat is basically pigmented resin, which adds no strength, does add weight, is heavy and eventually cracks. If you do want to use gelcoat and epoxy resin, you must let the gelcoat cure after being sprayed into the mould as it is a polyester product. Then scuff it and apply the epoxy laminate. Epoxy will bond to cured polyester, the other way not so much.

Done right the part will come out of the mould looking like this:




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Re: Making your own Fiberglass Parts [Re: JERICOGTX] #2607301
01/16/19 01:20 AM
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Originally Posted By JERICOGTX
Originally Posted By Doc Fiberglass
200$ for shipping is uNsane ! Someone at unlimited didn’t figure that out correctly. Each bumper should ship as though they were 25 pounds each.!PLUS I’ll bet you could send them by TRUCK FREIGHT (terminal to terminal)!for about that kind of money


Another fiberglass thread, and Doc thinks it's still 1982... He can build it better, cheaper, and ship it for next to nothing, but never does.


That was a different thread wave
This is the nwer UPgrAdded dOc whistling up


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Re: Making your own Fiberglass Parts [Re: David_in_St_Croi] #2607313
01/16/19 01:49 AM
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Spot on BTW.

I'm also thinking anybody making a composite bumper, isn't going to be looking for any real stiffness by adding any core material, actually maybe a little flexibility might be a better feature, since the new bumper ain't going to stop anything, and if the bumper flexes some, they may not have to repair it say of the hyd jack handle pops up into it.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Making your own Fiberglass Parts [Re: STEFF] #2607376
01/16/19 10:13 AM
01/16/19 10:13 AM
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Why make what you can buy! building a two piece mold to pull a female off the existing bumper and then another layup for the bumper its self, i don't see it being cost and time effective, unless it required to be a custom part that you cannot purchase.

Re: Making your own Fiberglass Parts [Re: JERICOGTX] #2607411
01/16/19 12:02 PM
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Originally Posted By JERICOGTX
Originally Posted By Doc Fiberglass
200$ for shipping is uNsane ! Someone at unlimited didn’t figure that out correctly. Each bumper should ship as though they were 25 pounds each.!PLUS I’ll bet you could send them by TRUCK FREIGHT (terminal to terminal)!for about that kind of money


Another fiberglass thread, and Doc thinks it's still 1982... He can build it better, cheaper, and ship it for next to nothing, but never does.


Yep. Complains about everyone else but never steps up to the plate. Same 'ol thing. Not sure why they keep letting Wally back in?! realcrazy


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Re: Making your own Fiberglass Parts [Re: RATTRAP] #2607416
01/16/19 12:28 PM
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Originally Posted By RATTRAP
Why make what you can buy! building a two piece mold to pull a female off the existing bumper and then another layup for the bumper its self, i don't see it being cost and time effective, unless it required to be a custom part that you cannot purchase.


After the OP finishes his bumper, he will agree with you. laugh2

And there is a another aspect, taking money out of the pockets of the fiberglass shops, just means they will shy further away from the oddball parts, and its a viscous downward cycle. I don't think they are overcharging, UPS maybe.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Making your own Fiberglass Parts [Re: jcc] #2607419
01/16/19 12:35 PM
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Originally Posted By jcc
Originally Posted By RATTRAP
Why make what you can buy! building a two piece mold to pull a female off the existing bumper and then another layup for the bumper its self, i don't see it being cost and time effective, unless it required to be a custom part that you cannot purchase.


After the OP finishes his bumper, he will agree with you. laugh2



I know STEFF wants other parts for his Road Runner, that are not made, so if he can learn how to make bumpers now, I'm sure a set of front fenders, and deck lid are in the future.


69 GTX 68 Road Runner
Re: Making your own Fiberglass Parts [Re: JERICOGTX] #2607423
01/16/19 12:43 PM
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Originally Posted By JERICOGTX
Originally Posted By jcc
Originally Posted By RATTRAP
Why make what you can buy! building a two piece mold to pull a female off the existing bumper and then another layup for the bumper its self, i don't see it being cost and time effective, unless it required to be a custom part that you cannot purchase.


After the OP finishes his bumper, he will agree with you. laugh2



I know STEFF wants other parts for his Road Runner, that are not made, so if he can learn how to make bumpers now, I'm sure a set of front fenders, and deck lid are in the future.

If that is the case, starting with an unavailable part would make more sense to me.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Making your own Fiberglass Parts [Re: GY3] #2607427
01/16/19 12:53 PM
01/16/19 12:53 PM
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Originally Posted By GY3
Originally Posted By JERICOGTX
Originally Posted By Doc Fiberglass
200$ for shipping is uNsane ! Someone at unlimited didn’t figure that out correctly. Each bumper should ship as though they were 25 pounds each.!PLUS I’ll bet you could send them by TRUCK FREIGHT (terminal to terminal)!for about that kind of money


Another fiberglass thread, and Doc thinks it's still 1982... He can build it better, cheaper, and ship it for next to nothing, but never does.


Yep. Complains about everyone else but never steps up to the plate. Same 'ol thing. Not sure why they keep letting Wally back in?! realcrazy


Mark,again the was a thread from yesteryear.I am a pro in my biz,when I see a vid or hear a story of of something I disagree with,like you I AM one to open my big fat mouth.I'm not ayin dOc is right or wrong but we all have an opinion and we do rub people the wrong way....oh well whistling

He WAS the man back in his day,let let that other thread GO!!!

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Re: Making your own Fiberglass Parts [Re: STEFF] #2607488
01/16/19 02:21 PM
01/16/19 02:21 PM
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I know what I know pretty well, but I also admit I definitely DON'T know what I don't know. I also have nothing to prove. That said:

I haven't attempted any class A surfaces, only structural repairs + "filled in" the underside of my 6 pack scoop to allow me to make an air pan. So this might not apply to class A but maybe it will be useful.

I made my mold out of cardboard covered with regular, clear box sealing/shipping tape. Some digging online revealed some statements that the resin would not stick to the shipping tape, which turned out to be correct.

No way would I suggest you could just cover the bumper with tape and go to town. But, maybe that idea might be enough to get started, make a huge mess, breathe some awful fumes, and could maybe be refined after that.

Re: Making your own Fiberglass Parts [Re: hemi-itis] #2607495
01/16/19 02:30 PM
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Originally Posted By hemi-itis
Originally Posted By GY3
Originally Posted By JERICOGTX
Originally Posted By Doc Fiberglass
200$ for shipping is uNsane ! Someone at unlimited didn’t figure that out correctly. Each bumper should ship as though they were 25 pounds each.!PLUS I’ll bet you could send them by TRUCK FREIGHT (terminal to terminal)!for about that kind of money


Another fiberglass thread, and Doc thinks it's still 1982... He can build it better, cheaper, and ship it for next to nothing, but never does.


Yep. Complains about everyone else but never steps up to the plate. Same 'ol thing. Not sure why they keep letting Wally back in?! realcrazy


Mark,again the was a thread from yesteryear.I am a pro in my biz,when I see a vid or hear a story of of something I disagree with,like you I AM one to open my big fat mouth.I'm not ayin dOc is right or wrong but we all have an opinion and we do rub people the wrong way....oh well whistling

He WAS the man back in his day,let let that other thread GO!!!


WHY are you addressing me when I am agreeing with what someone else said?! No clue about any other thread other than the fact that he repeats the same thing every time he gets on here. People that tear down others business practices and pricing DO rub me the wrong way as I have owned multiple businesses and know the type...

Re: Making your own Fiberglass Parts [Re: STEFF] #2607561
01/16/19 03:52 PM
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All good info here. Keep it coming as I am still trying to get out there to finish up my Super Shaker project for my Challenger. Injuring my knee this summer & having reconstructive knee surgery several weeks ago is making it difficult to get out in the garage to finish. Sure is taking a lot longer to heal than I was expecting. This getting old stuff sucks.

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Re: Making your own Fiberglass Parts [Re: 6PKRTSE] #2607598
01/16/19 04:35 PM
01/16/19 04:35 PM
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Originally Posted By 6PKRTSE
This getting old stuff sucks.

Getting old does suck. but it beats the alternative! grin

Re: Making your own Fiberglass Parts [Re: RATTRAP] #2607662
01/16/19 07:05 PM
01/16/19 07:05 PM
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Originally Posted By RATTRAP
Why make what you can buy! building a two piece mold to pull a female off the existing bumper and then another layup for the bumper its self, i don't see it being cost and time effective, unless it required to be a custom part that you cannot purchase.



I love learning how to do things for myself. Still may buy them from Unlimited,

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