I have a 15+ year old bottle of K&B micro balloons, came in one of those clear ketchup squeeze type bottles... it never seems to dwindle in volume... the stuffs like magic, a little goes a long way.; works great with JBweld for making non structural fillets on various types of metal... another great product was that F&M enterprises 2 part lightweight epoxy putty / filler... it was just like it had micro balloons in it, very low density; I use to just cut out equal parts with my exacto knife and then kneed it... great stuff to work with, and it sanded like balsa.
John M,
Last edited by John_M_; 08-04-2015 at 08:11 PM.