Trouble with epoxy.

5

540goat

I am painting the hood on my 99 vette. I had to fix a small spot. When I finished the spot I wet sanded the hood with 400, cleaned it with some wax and grease remover and waited a 1/2 hour, and then sprayed epoxy over the whole hood, a thin coat. I waited 2 days and put ppg black base coat over that. I waited another day and I noticed a spot that had checked, not the area I fixed. I sanded it with 600 wet after the paint was gone I noticed the epoxy was balling up on the paper. I was able to scrape the epoxy off with my finger nail. Any ideas what could have cause this and am I going to have to remove the rest of the paint, it seems to be fine. The only thing I can think of is I used activator that was opened about a moth and a half ago. But I had asked in another thread and was told that would be fine.
 
temperature? ive had activator open and closed for years with no problem...
 
The outside temperature was around 60, inside my garage was probably around 65-70.
 
Temperature, kept it above 60 deg.?
or mix maybe?,
(I hope you mixed epoxy to activator with a 1 to 1 mix ratio)
 
Everything was done by the book, the epoxy was mixed 1-1.
The weird thing is it happened in one small part of the hood. Everything else was fine.
 
All I can think of is either something was still in the glass in that spot or the glass never got warm enough for the epoxy to kick.

30 minutes on raw glass with cleaner could be the issue, also remember if 65 out the glass is about 60.
 
I never went down to the fiberglass. I just roughed up the paint. The only thing I would say is that the wax and grease remover din't dry in that small area and it reacted to the epoxy. Well anyway I wet sanded the area and feathered in the epoxt and put some base over it. I will see if there are any further problems tommorrow.
 
Friend of mine had his Corvette re-painted and had a spot on the hood bubble up after about a month. Failure spot was right above the A/C compressor. Apparently the compressor slung a mist of oil on the underside of the hood and it baked right into the fiberglass. The original paint didn't fail but everything sprayed later wouldn't stick. They ended up re-glassing that area. Hope that's not your problem because it was a bitch to fix.
 
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