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Author Topic: sanding fiberglass (paint prep) Primer GR40 ¯ Member # 476 posted                                 what is the best way to sand down fiberglass for prepping to primer and paint? -------------------- Superdupercharged Cobra No Transmatic Notch Posts: 2108 | Registered: Sep 2001  |  : Primer GR40 ¯ Member # 476 posted                                 ttt -------------------- Superdupercharged Cobra No Transmatic Notch Posts: 2108 | Registered: Sep 2001  |  : 4RS FED ¯ Member # 2067 posted                                 use sand paper and go in a circular motion -------------------- i have a twin turbo mustang and you don't! Posts: 3686 | From: 650 | Registered: Nov 2002  |  : Primer GR40 ¯ Member # 476 posted                                 how far down do i sand it? and what needs to be done before primer? -------------------- Superdupercharged Cobra No Transmatic Notch Posts: 2108 | Registered: Sep 2001  |  : sn8k2 ¯ Member # 2350 posted                                 Well, depending on the quality of the glasswork (and gelcoat if so prepped) - you may have a lot of pinholes to fill. This is best done with some thinly mixed bondo and with you hand (in a glove of course) just grab a dolop & rub the bondo over the entire surface of the fiberglass (remember, you are just trying to fill the pinholes here - nothing else). Allow to dry and then wet sand the entire piece using 220 or 300 grit. Do NOT sand the fiberglass to the point that the cloth material is exposed - just enough to take off the excess bondo and high spots (use a stiff rubber sanding block on flat surfaces too) . Now paint the first coat of primer and wet sand until you have sanded off just about all of the primer - allowing the primer to fill in the low spots. Sometimes this will take as much as 6 or so coats of primer - and each time, sanding most of it off. Obvious low spost can be filled with bondo - but keeping it thin and using care when doing so will mimimize the number of coats of primer. Now after you are satisfied with the look of the piece, apply a final coat of primer & very light wet sand the entire piece using 600 grit. Now get the entire piece wet (use a wet rag and wipe it over the glasswork), and now look closely at that slick-as-a-puppy's-peter creation you just made. If it doesn't look dead nutts perfect, then repeat the primer, wet sand, and inspection routine until it is smooth. Preping fiberglass for paint isn't hard, it just requires a lot of patience, elbow grease, and a good eye. The better the quality of glasswork and gelcoat, the easier it will be - and you do get what you pay for here. Happy painting bro -------------------- Mark K 2003 Cobra | 2001 Cobra | 1989 Black Mustang GT - the Savage Posts: 152 | From: Livermore, CA | Registered: Jan 2003  |  : Primer GR40 ¯ Member # 476 posted                                 -------------------- Superdupercharged Cobra No Transmatic Notch Posts: 2108 | Registered: Sep 2001  |  : 4.6GT ¯ Member # 2643 posted                              -------------------- CAR 2002 mustang GT 5spd 254rwhp/305 ft lb torque N/A Best E.T 1.93 60ft 13.1 @105 Posts: 320 | From: Nor Cal | Registered: Mar 2003  |  :

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