USC All Metal Quart
Product Review (submitted on April 10, 2013):
I have been using this in restorations for years in the body shop. I do not recommend this being your final filler as it is porous to an extent, We have always used it after any metal patch or large repair is accomplished as a base layer for strength and rigidity. Once cured this stuff is rock hard compared to standard polyester fillers, but not brittle... Note though, after wiped and sanded let it sit for a day or so before applying other filler to this to make sure it has time to harden correctly. I would suggest using this on any area you have welded after it has been grinded and before plastic filler work. Outstanding product, been using for 15 years!