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What grit sandpaper to work filler? #182483 01/03/09 01:26 PM 01/03/09 01:26 PM
Joined: Mar 2003 Posts: 4,931 Tri-Cities, Washington V VITC_GTX OP master
VITC_GTX OP master V Joined: Mar 2003 Posts: 4,931 Tri-Cities, Washington	To rough sand and final sand filler, what grit paper?

Re: What grit sandpaper to work filler? [Re: VITC_GTX] #182484 01/03/09 02:06 PM 01/03/09 02:06 PM
Joined: Oct 2005 Posts: 708 Mechanic Falls, Maine 4 4BBodies mopar addict
4BBodies mopar addict 4 Joined: Oct 2005 Posts: 708 Mechanic Falls, Maine	I start with 80 grit in my long board air sander, re-coat if necessary, then 80 again followed by 180 with a hand board (or block, depending on the size of the repair.) Try not to cut through the plastic and expose high spots, when you start seeing metal, you need to stop. If you have low spots, fill them then, let it dry, and sand again. I always skim the whole thing again. The best results are on metalwork that is as straight as you can get it, before you put the mud to it.

Re: What grit sandpaper to work filler? [Re: 4BBodies] #182485 09/01/10 10:07 PM 09/01/10 10:07 PM
Joined: Aug 2008 Posts: 4,085 Mo. racerx master
racerx master Joined: Aug 2008 Posts: 4,085 Mo.	Not trying to hi jack....but uall think that a surface(filler) primer will cover scratches from 180 grit paper? Thaxx...

Re: What grit sandpaper to work filler? [Re: VITC_GTX] #182486 09/01/10 10:39 PM 09/01/10 10:39 PM
Joined: Jan 2003 Posts: 8,510 Candler,NC / Myrtle Beach, SC J JDMopar master
JDMopar master J Joined: Jan 2003 Posts: 8,510 Candler,NC / Myrtle Beach, SC	Knock the skin off of it with 36 or 40, then work it down to almost done with 80. Then finish it off with 180. Don't try to look at it to see if it's smooth....feel of it with the hand you DON'T write with.

Re: What grit sandpaper to work filler? [Re: racerx] #182487 09/02/10 04:34 AM 09/02/10 04:34 AM
Joined: Jan 2003 Posts: 752 AZ - The "dry heat" state 71autoxr super stock
71autoxr super stock Joined: Jan 2003 Posts: 752 AZ - The "dry heat" state	Quote: Not trying to hi jack....but uall think that a surface(filler) primer will cover scratches from 180 grit paper? Thaxx... yes and no. i think most good primer would if you applied several coats (3 wet), but I like to sand with 220 then 3 coats primer, then final sand before paint. You might not cover 180 scratches with thin coats of primer or they may show through if you go from 180 to a much finer paper (400 etc) 68 AMX mopars red headed stepchild 69 Dart GT Convertible 340 4 speed 71 Challenger - looks like the avatar!

Re: What grit sandpaper to work filler? [Re: 71autoxr] #182488 09/02/10 09:20 AM 09/02/10 09:20 AM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	you work your way up, from what i understand...start with the 80 stuff, when you get that good and flat, jump to maybe 180 or 220 to remove the marks from the 80. then thick coat of filler primer and block with 400 prior to color shoot, yes? Photobucket sucks

Re: What grit sandpaper to work filler? [Re: JDMopar] #182489 09/02/10 12:46 PM 09/02/10 12:46 PM
Joined: Nov 2007 Posts: 1,476 Oh RacerGofKGB Got The Big One
RacerGofKGB Got The Big One Joined: Nov 2007 Posts: 1,476 Oh	Quote: Knock the skin off of it with 36 or 40, then work it down to almost done with 80. Then finish it off with 180. Don't try to look at it to see if it's smooth....feel of it with the hand you DON'T write with. This is how i have always done it.

Re: What grit sandpaper to work filler? [Re: RacerGofKGB] #182490 09/02/10 01:21 PM 09/02/10 01:21 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: Quote: Knock the skin off of it with 36 or 40, then work it down to almost done with 80. Then finish it off with 180. Don't try to look at it to see if it's smooth....feel of it with the hand you DON'T write with. This is how i have always done it. Me too, 36 grit to get it flat.

Re: What grit sandpaper to work filler? [Re: Challenger 1] #182491 09/02/10 02:31 PM 09/02/10 02:31 PM
Joined: Aug 2009 Posts: 1,878 Detroit, MI GetAwayDriver top fuel
GetAwayDriver top fuel Joined: Aug 2009 Posts: 1,878 Detroit, MI	When filler is cured, it has a waxy film at the top. Starting with 80 grit will just clog and waste paper. Start with 36 grit. The only exception might be for a very small imperfection (2-3" of area) where you wanted to keep any surrounding sand scratches to a minimum. I finish with 180, then primer. Then I block the primer with 240 dry if epoxy primer, wet if lacquer. When it's wet/shiny with 240, you have a good chance to look at straightness and it's another chance to get rid of sand scratches. Another coat, then wet block with 400 grit.

Re: What grit sandpaper to work filler? [Re: GetAwayDriver] #182492 09/02/10 04:43 PM 09/02/10 04:43 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	my body work guy thats helping me has used 40,80,150,320 said doing it 1x with 150 is better than 2x with 180 40/80 on the heavy work, scuff with 150,guide coat of primer,150,2nd coat of primer,ready for 320 working good for us,its just about ready for paint now just got all the spot weld drilling/welding done on the bed replaceing the floor/tubbing it with a cut down long bed

Re: What grit sandpaper to work filler? [Re: scratchnfotraction] #182493 09/02/10 07:12 PM 09/02/10 07:12 PM
Joined: Jan 2003 Posts: 2,431 USA S SSAAHemiFan top fuel
SSAAHemiFan top fuel S Joined: Jan 2003 Posts: 2,431 USA	finishing with 180 is fine if you are using a quality primer. I put a couple of coats of primer on the bodywork first before priming the rest of the panel. Most important is you want to control the first couple of primer coats so the primer gets down into the scratch and fills it - instead allowing it to bridge over the scratch and later shrink down into it.

Re: What grit sandpaper to work filler? [Re: SSAAHemiFan] #182494 09/02/10 09:50 PM 09/02/10 09:50 PM
Joined: Jul 2010 Posts: 40 Corona CA wyotech_cuda440 member
wyotech_cuda440 member Joined: Jul 2010 Posts: 40 Corona CA	I let it cure about 10 minutes, untill it's about as hard as a pencil eraser, then hit it with a body file to get it close. Wait another 5 minutes, and it should be hard enough to smooth with 180. Skim coat, wait 10, knock it down with the 180, then smooth it out with 220. When you feel it for smoothness, put a paper towell under your hand, you will feel any imperfections much easier with the paper. Daily driver: 2002 Dakota R/T, slightly modded Weekend machine: 70 cuda, 440-6 street/strip

Re: What grit sandpaper to work filler? [Re: VITC_GTX] #182495 09/03/10 12:27 PM 09/03/10 12:27 PM
Joined: Dec 2007 Posts: 1,572 Jacksonville Florida elitecustombody pro stock
elitecustombody pro stock Joined: Dec 2007 Posts: 1,572 Jacksonville Florida	I don't remember last time I used 36 or 40 grit are you guys building bondo sculptures? most of my bodywork I start with 120 followed by 180

Re: What grit sandpaper to work filler? [Re: elitecustombody] #182496 09/03/10 02:13 PM 09/03/10 02:13 PM
Joined: Oct 2005 Posts: 708 Mechanic Falls, Maine 4 4BBodies mopar addict
4BBodies mopar addict 4 Joined: Oct 2005 Posts: 708 Mechanic Falls, Maine	Same here, but I have been doing it almost 30 years.........as far as a sticky top layer, you don't get that if you spring for good plastic. Like Rage or Fuzion. (See Eastwood.com) 80 grit cuts the first layer very well, if it isn't 1/2 inch thick.........which it shouldn't be, if you did your metal work right.........

Re: What grit sandpaper to work filler? [Re: 4BBodies] #182497 09/06/10 04:05 PM 09/06/10 04:05 PM
Joined: Oct 2005 Posts: 1,305 Lakewood, Colorado herkamer pro stock
herkamer pro stock Joined: Oct 2005 Posts: 1,305 Lakewood, Colorado	I've found it depends on the plastic. Just started using Evercoat Quantum 1 and it's by far the best plastic I've ever used. No need for glazing putty, this stuff sands smoooooth! If it's rough body work or a big area, I start with 36 or 40 to rough it in. Skim coat and hit it with 80. Most of the time it can be left finished at 80 if you are using a good filling primer. I start blocking the primer with 150 to level it out, add one or 2 thin coats of primer and right to 400 wet. Working on my W350, I recently tried the Clausen All-U-Need Poly Primer. That stuff will hide a multitude of sins with as heavy as it covers. Body work to rough and final blocking in one shot. Matt 69 Dart Swinger 340 83 W350, Megasquirted with 46RH Old news: 72 Demon street/race mobile Latest: 70 Duster backhalf car and even more

Re: What grit sandpaper to work filler? [Re: elitecustombody] #182498 09/06/10 05:14 PM 09/06/10 05:14 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: I don't remember last time I used 36 or 40 grit are you guys building bondo sculptures? Heck yea, Sculptured up a new front fender for my car. Fender weighs alot now...lol

Re: What grit sandpaper to work filler? [Re: Challenger 1] #182499 09/07/10 01:29 PM 09/07/10 01:29 PM
Joined: Oct 2005 Posts: 708 Mechanic Falls, Maine 4 4BBodies mopar addict
4BBodies mopar addict 4 Joined: Oct 2005 Posts: 708 Mechanic Falls, Maine	Lol............bondo sculptures.........you guys would not believe what I saw while doing bodywork full time. The most memorable was a '68 Karman Ghia. The nose, from the headlights down, was common house screen, covered with 1/2 inch to 1 inch of plastic! Oh, there was rusty metal here and there, which they must have used as a guide, but there were so many cracks in it it was all but falling off! And the owner couldn't figure out why I wasn't able to "re" repair it! Wish I had a pic!

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