I have 16 sq ft of this stuff laying around from an old project. Anyone know anything about it. I have plenty of cloth ordered for my build, so just wondering what this stuff is, wt, etc, and if it would be OK to use in a pinch. Only number I can find on packaging is 499, but unable to find any info on it. Just FYI.. I don't plan to use Bondo on my kayak, but I have some spots that look look they could use though!! :)