I used the window weld on my top ATX mount, it helped out a lot, but it's not the strongest stuff and I think Demon said it'll wear out after a while. But it is cheap and easy to get, so I guess it depends how much of an improvement you want and I would think it would give you less NVH. It wouldn't be strong enough to use as a mount material by itself (just add into stock mount and keep stock material) but I think some of these other products are strong enough to replace the stock material completely.
