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I am repainting my motorcycle with some spray cans and I have painted the tank, front fender and rear fender pieces all with the same primer, same color, and same clear coat successfully. A little bit ago the side of my tank got some cosmetic damage so I sanded it back, re-primed it, re-painted it and then coated it with the same exact clearcoat that worked the first time and it cracked on me. I figured that I had some type of surface contamination that the clear didn't adhear to so I sanded it back and re-primed and painted then cleaned and degreased it only to have this cracking happen a second time. Third time I repeated the same steps but then sanded the color lightly with 1000 grit to try to give the clear topcoat something to grip. Then I, again cleaned and degreased it to a point you could eat off it and this cracking happens again! Any help would be greatly appreciated as I'm at the point I'm wanting to sell my bike this is frustrating me so much.

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  • Did you remove all the old coats of paint back to the metal? – HandyHowie Jun 11 at 7:18
  • Yes, each time I repainted I stripped it all the way back – user168694 Jun 11 at 16:48
  • Did you change the amount of time between coats. – HandyHowie Jun 11 at 17:53
  • Nope same time between coats. The cans say to wait 48 hours to fully cure and I waited 72 between each coat – user168694 Jun 13 at 8:00
  • You should be able to tell which layers are reacting by sanding it down slightly and seeing which colours appear. You could try a few tests spraying clear coat on base colour without primer and also clear coat on primer to see which react. If all the variables are the same, it doesn’t make sense for it to work once but then react. – HandyHowie Jun 13 at 8:21

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