If your talking about the spoiler on the truck in your profile pic then there is no spray can clear good enough to fix your problem. The best advice i can give you is to remove the spoiler yourself and take it to a reputable body shop and have it repainted. By removing it yourself your gonna save money and by not spraying rattle can clear coat on it your gonna save money. It wouldnt cost a ton of $ to have it painted again, mayb $120. Thats my .02