Paint not curing?

A

ancient

New member
Hello,

I did paint my Corvette 1981 chassis following these steps:

- sandblasting with fine silicate sand
- blowing dust with air compressor
- degreasing with silicone remover
- washprimer from 4CR (2:1)
- epoxy primer from 4CR (2:1)
- final paint (2:1:5%)

It was 7 days ago, 1°C (=34°F), 80% humidity in the garage.

Now it's 7°C (=45°F) , 60% humidity and the paint is coming off by lightly scratching my nail on it :crap:

What's wrong, did I miss something or is it just not curring because of the cold weather / humidity?
 
A

ancient

New member
I can't remember the brand but it's a 2:1 (fast hardener 0407 from 4CR) + 5% of acrylic thinner from 4CR (0505)

That paint doesn't require clear coat
 
T

tomsteve

New member
not sure about the products you are using, but thats some pretty cold temps for what i shoot. i wouldnt atempt to shoot in anything under 60f.
 
A

ancient

New member
Yeah the specs say 60f but my paint seller told me it will be okay to paint in these conditions.. weather is getting better here I hope it fix my problem
 
O

obstahoe

New member
Next time use a rapid activator and try to warm up the garage a little at my old shop we were spraying in 40f temps inside the shop and had no problems were using glasurit with u tech clear
 
TAZ

TAZ

Administrator
Staff member
Just to confirm it's the base and clear peeling? Not the primer to?
 
A

ancient

New member
Today it has been warmer and I let the garage doors open for a few hours.. it is curing, slowly but it is!! Cannot scratch it with my nails now, i'm relieved
 
TAZ

TAZ

Administrator
Staff member
Glad to hear it's working for you.
Cool weather will definitely slow dry times down.
I would say you have something sandwiched in all the material you sprayed that didn't cure properly.
 
A

ancient

New member
Yes I guess it's the epoxy primer. I have a question related to that:

I put a normal paint on top of that epoxy primer, wouldn't have been better to put a epoxy based paint over the epoxy primer?

I still have a few parts to paint (driveshafts, differential.. parts exposed to flying gravels) so I'd like to know before buying paint
 
TAZ

TAZ

Administrator
Staff member
Once the epoxy primer is cured, you can put anything over it.

I was thinking the problem could have been the 'wash primer' you sprayed. You'll just need to peel a piece and look real close and see what the problem is.

TAZ, Another question, if something is "sandwiched", can it still cure over time?
Click to expand...

To be honest, not for sure on this. You can never tell I guess or unless you chip a piece and take a close look at few months after painting.
 
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