I recently came across a suggestion that to quiet Fastrack - simply fill the track with lightweight Bondo.
Has anyone tried this approach and if so, what were your results?
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This doesn't seem like the best idea to me. Bondo, and other body fillers, are a light weight material. it may help a little, but I think there are other things that would do a better, or equal job at lower cost, perhaps something like great stuff foam? Bondo also has one main issue that would concern me here; it gets hot when curing. the thicker the application the hotter it gets, and it may warp the plastic road bed from this heat.
JGL
I wouldn't try to fill the Fastrack with Bondo or any type of spray foam since these all contain various solvents and could damage the track. I think a better option would be not to worry about filling the underside of the track but lay it on a cushion material like felt or foam. Secure the track in place with zip ties rather than screws to lessen the sound transmission from the track to your benchwork.
What are the sound attenuation characteristics of Bondo? That will answer your question. Bad suggestion. Don't clean it using Simple green is a good one.
There are specific products designed to deaden sound and vibration. Just google sound deadening coatings and materials. When you find a few that look like they might work contact the comapny and ask what they recommend for plastic.
Pete
How about Flex and Seal....Soft ,thick, flexible and dense.
