Been at these trade for over 25 years and in the last number of years I am starting to notice a problem that keeps coming back. I painted a customers truck last year, base clear, and water sand and buff the rig. now when it left my shop it looked great. A few weeks back the customer came back to me so I can give it a once over making sure everthing was safe before he started using it agian.Well looking at the finsh on the truck I notice that the water sanding marks returned. I have run into this problem before with buffing a car that had paint on it only days old. I tried to avoid this with this truck and let the paint dry for a few weeks and when I water sanded it left it alone for another week then buffed it. The clear coat I use is Dupont and talking it over with one of my local paint reps and he said to me that the paint can take up to a year to dry and if you open up the paint this problem can happen!! Come on!! that is nuts. so ever custom paint job I do I have to wate a year before I buff it?? I`m thinking it is the product and in the last number of years Dupont has changed there clearcoat line a number of times and todays clears don`t have the hardners that clears had 10 years ago. I know there is alot of other product out there and I am wondering if this is just a problem with Dupont. Has anybody come across this problem and if so what did you do to fix it. This problem is pissing me off cause I try to give my customers top notice paint work and having problems like this coming back a year later makes my work look bad.