This never made it to the list Larry H Sent from my iPad
Begin forwarded message: > From: "Larry H." <lah...@yahoo.com> > Date: March 24, 2011 12:09:50 AM CDT > To: KRnet <kr...@mylist.net> > Subject: Re: KR> Peel Ply / Slurry > > Pat Russo wrote > I generally use Styrofoam, (blueboard), > applying a wet resin layer, then a slurry layer followed by fabric and > stippling.... ending with a squeegeeing of excess resin > > The whole idea of using slurry is to make the piece you are building weigh > less. The glass balls (microspheres) take up space and weigh less than pure > resin. The idea in the old days was for this mixture of resin and > microspheres (slurry) to be as thick with microspheres as you could spread > without tearing up the foam you were covering. The more microspheres that is > added to resin the thicker it gets and the mixture weighs less but the slurry > mixture can reach a point of being so thick that spreading it is almost > impossible without tearing up your nicely sanded foam surface. The idea is to > add as much microspheres as you can to the resin but still be able to spread > it onto your foam without tearing up your foam of course! This mixture was > developed to penetrate the pores of rigid urethane foam which is very porous > and later the klegicel foams that are now used, thus less weight parts as > compared to parts made with pure resin filling the pores of the foam. > > Step one should be the slurry mixture on the foam (if you use pure resin > first you are filling the pores of the foam and making the part heavier) > Step two add your cloth of choice > Step three add only as much resin as it takes to wet out the cloth of choice. > Any extra resin only makes the part heavier not stronger. > > If you are using insulation foam that has a nonporous solid surface, I would > not recommend that foam but I am not totally sure what good the slurry is > doing if it is nonporous foam. > Just my opinion. > Larry H. > > > >
