"Mark" primer with my fingernail...Problem?

J

jtfx6552

Member
Before welding on my rear 1/4s and the rest of the rear panels, I sprayed the trunk floors with SPI black epoxy.

It's been a few weeks, and from the test fitting process of the rest of the panels, oI had some metal shavings, and general dirt on the trunk floors, so i took my shop vac to vacuum them up. I noticed that the plastic nozzle was "marking" the epoxy. Not scratching through it or anything, but leaving a change in sheen that doesn't seem to wipe off.

It isn't were I was grinding the metal shavings into the primer with the vacuum either. Anyway, I noticed I can make the same marks with my fingernail? Edit to add picture:
IMG_2220.jpg


Now, I won't have exposed epoxy when the car is done, I plan to top coat everywhere, but I wonder if I did something wrong to leave the epoxy "soft" or something?

Thoughts?
 
I can't tell if you are just scratching it, or it is soft, You have to push on it with a fingernail, if it leaves a dent it is not curing. If you have left it in the cold when it was fresh (below 60 in the first 24 hours) it may have gone dormant and it might need some nice heat to bring it back to life so it will cure up good.
 
I can't actually leave a dent, it does not feel soft, it just is easily "scuffed". I guess scuffed is as good a word as any?

I was aware of the temperature restrictions. I sprayed in a heated garage. I do open a window and have an exhaust fan running while actually spraying, but the temperature doesn't drop much during that short period. Then I close the window, and it gets pretty warm in there. High 70s low 80s, and I leave the heat on for at least 12 hours, then leave the garage closed after I turn the heat off, which in the weather we've recently been having, keeps it 60+.
 
That's what makes it sand easily.
It's normal.
If it didn't do that it would have to be as hard as concrete
and it would sand that way too.
 
Try sanding it with 320 or 400 dry. If it is cured, it will turn to power. If it is not, little balls will stick to the paper. Like crash said, I think what you are experiencing is normal.
 
I have some brush applied epoxy that is 8-10 days old. I tried and could not get my thumbnail to leave a mark on it or change its sheen. It is more glossy then satin in appearence.
 
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