Re: engine paint
[Re: DrCharles]
#2720313
11/29/19 07:07 PM
11/29/19 07:07 PM
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Joined: Jan 2003
Posts: 20,644 So Near, Yet So Far
topside
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,644
So Near, Yet So Far
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Never had a peeling problem, and the 1st engine I painted was in the early '70s. Oldest one I have is still fine 33 years later. That's rattle-can engine paint, rattle-can "industrial" paint (race cars, non-OEM greys), or Bill Hirsch paint from a gun. It's critical to start with a clean, grease-free surface. I always use a primer with some zinc content, though others here don't prime at all. I scuff the tin with a red Scotchbrite pad after cleaning & before priming.
Ironically, the worst "luck" I've had is with powder-coated wheels; I'll never do that again.
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Re: engine paint
[Re: DrCharles]
#2720326
11/29/19 08:00 PM
11/29/19 08:00 PM
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Joined: Jan 2003
Posts: 15,193 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,193
Omaha Ne
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I can't speak for the OP, but I definitely used Grease & Wax Remover then a rinse/wipe (think it was brake cleaner). Yes, surface prep is usually the most common cause of paint failure, but I knew that and followed directions I suspect the machine shop sprayed some kind of gray coating or paint on the block to keep it from rusting. Where the paint has come off in big sheets, there is hardly a trace of rust underneath. Maybe I should have sanded first! It may have been exposed to some sort of contaminant like silicone ( think lubricant overspray) and that can be a real problem to get rid of, especially on a porous surface. Sanding typically would only spread it around. The only other thing I can think of would be to use a metal etch solution.
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Re: engine paint
[Re: TJP]
#2720329
11/29/19 08:21 PM
11/29/19 08:21 PM
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Joined: Jan 2003
Posts: 43,458 Round Lake Beach, Illinoisy
Rhinodart
Rhinotruck
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Rhinotruck
Joined: Jan 2003
Posts: 43,458
Round Lake Beach, Illinoisy
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I use paint from www.hirschauto.com and have never had a problem. I have even brushed it on with no brush marks.
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
JB Rhinehart, Realist
A-Body's RULE!
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Re: engine paint
[Re: TJP]
#2720330
11/29/19 08:30 PM
11/29/19 08:30 PM
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Joined: Apr 2012
Posts: 80 taunton, mass. 02780
moparthunder70
OP
member
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OP
member
Joined: Apr 2012
Posts: 80
taunton, mass. 02780
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thanks to everyone for their input on my problem...I did use an engine degreaser and wire brush and cleaned the block as best I could....I'm going to do this again but this time I'll try using the brake cleaner and wire brush...while I agree that the problem might be the prep, I did do prep work last time...maybe the third time will be the charmer..thanks again to everyone for your input...I might look into a high temp primer..
Last edited by moparthunder70; 11/29/19 08:34 PM.
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Re: engine paint
[Re: Rhinodart]
#2720361
11/29/19 11:13 PM
11/29/19 11:13 PM
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Joined: Jan 2007
Posts: 531 Charlotte, NC
Kowal
mopar
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mopar
Joined: Jan 2007
Posts: 531
Charlotte, NC
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I use paint from www.hirschauto.com and have never had a problem. I have even brushed it on with no brush marks. I agree, I have used their paint from a rattle can and a quart, always a good result. High solids, dries fast, forgiving of my mistakes. I have it on two engines.
'69 Hemi Charger 500, ‘70 U code Challenger R/T (These and a bunch others at www.dkowal426.com) P.J. O'Rouke: "The old car ran perfectly, right up until it didn't."
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Re: engine paint
[Re: lilred]
#2720367
11/29/19 11:28 PM
11/29/19 11:28 PM
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Joined: Jan 2003
Posts: 3,122 Auburn WA
Dave_J
master
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master
Joined: Jan 2003
Posts: 3,122
Auburn WA
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I use to wipe the block with acetone, then wipe with muritic acid and then a dulted baking soda water wipe to neutralize the acid followed by clean water. One more wipe with acetone.
Get the block very warm to the touch and lay on light layers of color. I had a old electric wall oven that I built a sheetrocked and R19 insulated paint oven that was 4 foot cubed inside for baking parts. Set it to 150F for 1/2 hour.
All these new paint formulas are crap without the lead and other dangerous chemicals.
Retired, US ARMY 1973-1994 ASE mechanic, Electrical 1994-1997 Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter 65 Formula S Cuda 78 Little Red Express Truck 98 Buick Regal (wifes car)
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