I found the Finnegan's waxoyl type underseal didn't respond well to wire type cup brushes on an electric drill. The wire brush clogged up real easy and was pretty useless after that. It felt a bit like stirring soup or watching someone mop a dirty floor just to rearrange the dirt. I used a thin scraper to take off the worst followed by white spirit solvent on a rag in the end.
Maybe a wire brush in an angle grinder would be better due to the higher speed. Then again wouldn't it just fling black gunge all over the place?
Any idea what product the rubbery underseal might be?
Adam
TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, 214 Cam, Lumention, Tubular Manifolds, S/S Single Pipe Exh, 3.08 Rear, 200lb Spax & PolyBushes all round, Anti- Dive, Strut-Top Roller Bearings, Capri Vented Discs & Calipers, Braided Hoses, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AT 5 Spokes and Cruise Lights, S/S Heater Pipes, Replacement Fuel Tank. No Door Stickers. Mine since July 1986, V8 from 1991