An easy way to remove undercoating....

[BobT-47P15]

......and maybe even caked on grease and dirt. A mini needle scaler.

Here's a link to some posts about the item on the HAMB.

Sounds like a useful tool.

http://www.jalopyjournal.com/forum/showthread.php?t=586538

[Adam H P15 D30]

I always used a propane torch to heat it slightly to soften it. Then scrape it right off. Works for seam sealer and lead also.

Stinks pretty bad so make sure the wife isn't home.

[Plymouthy Adams]

flashing with a torch is safe and easy way...been doing it this ways for years...what little residue is left is so quickly cleaned with solvent for a nice finish with less disturbance of original prime/paint removed from the substrate

[knighthawk]

torch ! use a cutting torch, hold the lever down, keep moving, cover your face AND arms, and open the garage doors !

[jcmiller]

What is the consistency of the material when you remove it this way? I ask because one of my cars has asbestos in the undercoating and it needs to come off in order to fix up the car. This sounds like a method that might keep fibers contained in the matrix, unlike grinding, sanding, blasting, etc. Thanks.

[Plymouthy Adams]

I have found that you heat flash the material till you see it just changing color..(going from a solid to a paste)...work an area about 1 sqare foot at a time by continious movement of the torch..I use the BenzOmatic propane for this..anyway..when it changes color is is going back to a putty like state..at this time just use a putty knife and it will roll right off into a curl. Once the entire area is void of the heavy undercoating, any traces of residue is easily removed with solvent..this method keeps the stuff in a wet or putty like state at all times...dust is at a minimum..normal road dirt that collects to this stuff is the real dirty part of removing the coating.

[jcmiller]

Thanks. Maybe I'll give it a try on a test patch.