- Mar 30, 2005
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89redvert, man thats a hard one - what I used to do was paint behind the taillights too so i could sand back there until i broke through w/o it bein seen, than i would know how far i could go - but for u , just sand and dry off untill you don't see any bumps or little shiny spots - thats when you'll be done, but its sooo hard to know exactly how deep it is, or how deep you are going -