E39 540i: M5 Kit - Fiberglass, How To Prep... - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 03-30-2005, 11:46 AM
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My M5 body kit (front and rear bumpers) came in finally ...after 10 days of US customs impound. ghead

The result is pretty good i think, it is gray fiberglass (semi-smooth) on the outside and black smooth sealed on the inside. Obviously it is not prepped for painting yet, but i was wondering what i needed to do to prep it. Additionally, there are a few nicks in the surface. Is there an easy way to patch these.

Any help would be appreciated - THANKS!

(hopefully i will be able to attach some photos of it later....)

Regards,
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#2 (permalink) Old 03-30-2005, 11:50 AM
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it depends on the type of primer your using. If it's a high build primer, you can sand the whole kit smooth with 180 - 220 grit and then clean it extremely well and prime it. If the nicks are small, The Bondo brand one part putty / glaze is extremely cheap and works extremely well. BE CAREFUL, though - fiberglass sands extremely fast and can wear uneven with varying pressure.

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#3 (permalink) Old 03-30-2005, 11:51 AM
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Quote:
Originally posted by sp0rky@Mar 30 2005, 10:50 AM
it depends on the type of primer your using. If it's a high build primer, you can sand the whole kit smooth with 180 - 220 grit and then clean it extremely well and prime it. If the nicks are small, The Bondo brand one part putty / glaze is extremely cheap and works extremely well. BE CAREFUL, though - fiberglass sands extremely fast and can wear uneven with varying pressure. You could even just use a 600 - 800 grit to be on the safe side and just take longer doing it. If you know what a scratch from 180grit sand paper looks like.... Any surface imperfections that size the primer will fill in nicely.


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#4 (permalink) Old 03-30-2005, 12:15 PM
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I allways use glaze, its just so easy to fill those little nicks, rather then sanding them down and possibly digging yourself a wave. Just make shure you block it when sanding, this will keep it from looking like a crappy civic body kit with waves everywhere.

Good Luck
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