Urethane over lacquer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hawker7 · 11-08-2008, 05:55 PM

I'm getting ready to paint my firewall and have it all cleaned and sanded. I bought single stage urethane and was planning to spray it over the factory finish that I assume is lacquer. Will there be any problems with this? I hope to do this on the rest of the truck as well.

LONGHAIR · 11-08-2008, 06:41 PM

"In general" you can spray nearly anything over lacquer, but you can't spray lacquer on top of anything else.
It will be ok as long as you have it clean of any oil residue and sanded adequately.
The firewall/under-hood is fine, but I don't think I would do it on the outside of the body though. The lacquer could still "check" (crack) under the top coats. It would be subjected to the sun on the outer body.

Hawker7 · 11-08-2008, 06:53 PM

what would I have to do to spray it on the outside? I would really like to not have to strip the paint.

ont_guy_38 · 11-08-2008, 08:23 PM

I don't think they ever put lacquer on a truck

Hawker7 · 11-08-2008, 08:25 PM

what did they come with from the factory?

ont_guy_38 · 11-08-2008, 08:29 PM

older trucks would have enamel and then acrylic enamel,very late 80,s would be B/C

cdowns · 11-10-2008, 11:56 AM

old original paint you'll be fine to spray over//firewalls make sure you've got all remnants of the grease pencil markings off the old finish

50adrod · 11-13-2008, 08:11 PM

be carefull with urethane over lacquer. I learned the hard way on my 71 vette. after 6 months the areas that still had lacquer on the body caused the paint to have tiny bubbles. to avoid this make sure to seal it with a quality epoxy primer

carpainter · 11-14-2008, 07:53 PM

Quote:

Originally Posted by 50adrod

be carefull with urethane over lacquer. I learned the hard way on my 71 vette. after 6 months the areas that still had lacquer on the body caused the paint to have tiny bubbles. to avoid this make sure to seal it with a quality epoxy primer

11-08-2008, 05:55 PM	#1
Hawker7 Registered User Join Date: Jan 2008 Location: Raleigh, NC Posts: 321	Urethane over lacquer I'm getting ready to paint my firewall and have it all cleaned and sanded. I bought single stage urethane and was planning to spray it over the factory finish that I assume is lacquer. Will there be any problems with this? I hope to do this on the rest of the truck as well.

11-08-2008, 06:41 PM	#2
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	Re: Urethane over lacquer "In general" you can spray nearly anything over lacquer, but you can't spray lacquer on top of anything else. It will be ok as long as you have it clean of any oil residue and sanded adequately. The firewall/under-hood is fine, but I don't think I would do it on the outside of the body though. The lacquer could still "check" (crack) under the top coats. It would be subjected to the sun on the outer body.

11-08-2008, 06:53 PM	#3
Hawker7 Registered User Join Date: Jan 2008 Location: Raleigh, NC Posts: 321	Re: Urethane over lacquer what would I have to do to spray it on the outside? I would really like to not have to strip the paint.

11-08-2008, 08:23 PM	#4
ont_guy_38 Registered User Join Date: Jul 2007 Location: Ontario Canada Posts: 1,006	Re: Urethane over lacquer I don't think they ever put lacquer on a truck Last edited by ont_guy_38; 11-08-2008 at 08:29 PM. Reason: spelling

11-08-2008, 08:25 PM	#5
Hawker7 Registered User Join Date: Jan 2008 Location: Raleigh, NC Posts: 321	Re: Urethane over lacquer what did they come with from the factory?

11-08-2008, 08:29 PM	#6
ont_guy_38 Registered User Join Date: Jul 2007 Location: Ontario Canada Posts: 1,006	Re: Urethane over lacquer older trucks would have enamel and then acrylic enamel,very late 80,s would be B/C

11-10-2008, 11:56 AM	#7
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Urethane over lacquer old original paint you'll be fine to spray over//firewalls make sure you've got all remnants of the grease pencil markings off the old finish __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

11-13-2008, 08:11 PM	#8
50adrod Registered User Join Date: Jun 2008 Location: Louisiana Posts: 493	Re: Urethane over lacquer be carefull with urethane over lacquer. I learned the hard way on my 71 vette. after 6 months the areas that still had lacquer on the body caused the paint to have tiny bubbles. to avoid this make sure to seal it with a quality epoxy primer __________________ 1971 Corvette convertible 454@ 525 hp 1936 Chevy Truck street rod 1952 Chevy truck hot rod build http://www.killbillet.com/showthread...2-Chevy-Cut-up 1964 F 100 custom street rod http://www.ford-trucks.com/forums/12...mark-viii.html 1950 custom Chevy Truck Last edited by 50adrod; 11-13-2008 at 08:12 PM.



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