I found my old air brush and and air compressor the other day. I am going to try using it to spray an extremely thinned down mixture of silicone the next time I need to seam seal something. I will of course test it before I try actually spraying a tarp, but I don't see any reason it wouldn't work. If it does work it would make seam sealing a very fast and easy task, 180 degrees from what it is now.