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Hi, I'm trying to paint my surfboard bag white so it fits in better with my flat. I tried spraying it with some enamel paint i found in wilkos quite cheap. But the paint is now cracking off whenever I carry the board bag around. I need a paint with flexibility that'll stick to my board bag. The surface I want to paint is currently a matt silver plasticky finish, a bit like the silver top side of duct tape. It gets carried around quite a bit so the paint would need to resist some flexing of the underlying material. Which paint is best please? Let me know if you want me to send a pic. Thanks