Quote:
Originally Posted by caverman
I need help with figuring out what I’m doing wrong with painting my engine cover and how I can now fix it.
I taped off my engine cover and then wiped it down with a wet paper towel that had a couple drops of Dawn dish soap and then let it dry. I picked up a can of Rustoleum for Plastic at Home Depot.
The first time I sprayed it came out almost perfect. There were a couple minor specks/dirt in it. So my friend talked me into lightly sanding and re-spraying. I sanded a couple pieces out and let it sit overnight. In the morning I re-sprayed and it did this cracking you see in a couple spots. So, I sanded out most of the cracking and let is sit over night again. Spayed it the next afternoon when it was about 65 outside. I got some cracking again. Re-sanded....waited overnight....resprayed. This time it didn't crack. Waited several hours or so and sprayed some clear over it. On one side it immediately cracked. Other side is fine. I re-sand (can't get all the cracking out but got most of it)....re-spray....all is good. I let it sit overnight and then this morning I let it sit out in the sun for a good 3+ hrs. Bring it in let it cool down for about 30 mins. Re-spray the clear and it freakin starts immediately cracking. I'm done now....I've lost the battle. Have no idea what to do.
BTW: in between coats I've been wiping it down with the stuff I use to clean my granite. It's a mix of 70% water, 30% alcohol, and a couple drops of dish soap. I wouldn't think this would cause the problem but maybe it is???
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Last year I bought a bunch of model cars and was painting them using Krylon Fusion spray paint then covering them with Krylon Clear. They always did this exact same thing. Come to find out it's as chef-beavis said.
Though my testing I found out that if you are going to paint over something that was just spray painted you must leave the item in a room where it is constantly at least 70 degrees for 1 week before painting. If you don't, the first coat will not completely cure and will do what you are experiencing.