Well that $1.00 ionizer has paid for itself well. During my fill coats of epoxy I was plagued with dust even with wetting out the air and floor of the garage first so I was dreading the varnishing ahead. Well, I set the ionizer up in the garage as Edgar noted in his post and misted the air and floor, put up a no trespassing sign on the garage door and commenced to varnish. (Wife wasn't happy shouting through the garage windows when she needed me.) Well I got up this morning expecting the usual dust on the hull and low and behold there was absolutely none! I'm hooked with using one from this point on.