Primer Problems

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PostPosted: Mon Oct 15, 2018 11:45 am
you may be able to take a razor blade scraper and CAREFULLY peel the 2k off. your bound to gouge and scratch what's under the 2k, but that should be easy to fix. then your back on page one with some epoxy or 2k what ever you want.
Jay D,
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PostPosted: Tue Oct 16, 2018 12:03 am
1968 Coronet R/T,

Don't know if this makes any difference, but the primer isn't gummy.
When I sand it, I get dust -- but also get small lumps in the sandpaper.

Due to a nosy neighbor turning me in to code enforcement, I can't use my
Iwata spray gun. I rolled a couple coats of thinned and hardened primer on the all fiberglass body, then sanded out the roller marks as good as possible. Then sprayed a coat using several Preval spray bottles. That brings me to where I am now.

The primer isn't sticky or gummy until I use thinner to try and remove it -- and after it dries it's not sticky again.

Thanks,

Jim

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PostPosted: Tue Oct 16, 2018 2:06 pm
Whenever you get lumps and the paper clogs up really bad, I consider that gummy. The heat from sanding turns it soft and it mushy.

I am not sure how close your neighbor lives but maybe try spraying while he is sleeping?
Hopefully you have good ventilation so that the vapors are moving quickly out of your booth and dissipating.

Rolling primer is one thing but I cannot imagine good results with base and clear.
1968 Coronet R/T


ACTS 16:31

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PostPosted: Tue Oct 16, 2018 2:16 pm
After posting I thought about the heat from sanding making the primer gummy.

I don't have a booth, and was spraying the primer in my driveway.

I don't have good ventilation in my garage to try it there.

Plan was to get the body primed and blocked and leave it that way for a while
as I continue the build on the car.


Thanks,

Jim

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PostPosted: Tue Oct 16, 2018 6:07 pm
if you are rolling normal 2k primer perhaps the solvents are not escaping as intended making it clog your paper and the primer staying soft,
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PostPosted: Tue Oct 16, 2018 6:36 pm
I believe your getting the plugged up paper because the 2K isn't cured and because of the lacquer thinner it may not get any better. note I said believe and may not, that means i'm not 100 % on this. it could be ok but there's a good chance it could not. I wouldn't want waste color going over it but that's just me. park it out in the sun for a few days and see what happens.
Jay D.
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PostPosted: Tue Oct 16, 2018 10:10 pm
Thanks Dave & Jay,

I've been wondering if the rolled primer might be trapping solvent, especially because I think the rolled on primer wasn't urethane. I can't remember for sure -- I've slept since then, but the car had primer rolled on it before this last urethane gallon came.

Anyway, I will try letting it sit in the sun and see if that helps.


Jim

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PostPosted: Wed Oct 17, 2018 8:51 am
Just a note on your plan.

It's not a good idea to leave a car in 2k primer for extended periods, especially if it will be exposed to the elements.

Once you get it blocked and are happy with a panel, apply a sealer coat to protect all your hard work from contamination.

When you are ready to move on to paint, simply wet sand the sealer coat.
1968 Coronet R/T


ACTS 16:31

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PostPosted: Wed Oct 17, 2018 1:57 pm
Gotcha.

Good idea, thanks.

Jim
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