That using Fingernail Polish for a sealant on a over the shot wad works great. I did 100 plastic and 66 paper hull 410 using the finger nail polish as a combination glue and sealant over the shot wad and it worked great. Nice thing too is the finger nail polish has its own brush and you do not have to worry about it drying out as long as you keep it in the bottle. I suspect the only time that happens is when the bottle gets empty. Nice thing is its cheap too and goes a long way.