im trying to repair a dash crack so what i did is i grinded it out, put some filler in it, and so far its looking good. ive put a few coats of underocating on it to give it the texture back. however its not exactly even. i tried sanding a little bit with a fine paper but it just seems to get blocked up with the rubber... has anyone sanded it before?? i know u can grind it and thinner will also dissolve it as well.

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Perhaps try wet sanding it?

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the best thing ive gotten to try is acetone, the acetone will eat the undercoating, and aslong as u use a rag and press evenly or even wrap it around a sanding block it will leave it even almost like sanding.

__________________
95 E320 24k
07 E550 4matic 20k Soon to go
1977 240d 481k
2013 SL 600


Non MBs

02 Ford F250 Lariat 4 Quad Cab 7.3 Diesel 95k
01 Chevy Suburban 249K LT 5.3 V8
88 Saab SPG Convertible 32k
06 Lincoln Mark LT 59k
62 VW Bug
52 Bentley Mark IV
53 GMC half Ton Pickup
08 VW Beetle convertible 2k
07 bmw x5 4.8i 17k
03 bmw x5 4.4i 40k
08 Range Rover S 9K