Polyvinyl VS Epoxy Resin
Nothing much different that the last time around... spray the plug with PVA,
wax it 3 times and start laying the glass. The big difference was the resin
In the past, I have used West Systems epoxy but when I ran out and could not
find it locally I bought 3 quarts of polyvinyl resin. I could have used
polyester, but I am getting ready to build wingtips that double as tip tanks
and the polyvinyl will withstand fuel so I decided to give it a try.
I found it much easier to work with since it is stickier than the epoxy.
When laying the glass in multiple layers at a time it held to the concave
shapes much better. When using epoxy, it is a constant fight when trying to
brush or squeegee resin into other parts of the layup. The polyvinyl kept
it put even when spreading resin away from the curves (like the one aft of
the spinner where the round shape joins the cheek). Its working time was
just as long but it sets up much faster which can be varied by how much
MEKP you put into the resin.
The only down side is that it eats pink (or blue) foam (polystyrene).
Anything that is made from it must be coated with epoxy before using polyvinyl
over it. Oh ya, its eats the plastic cups I usually use with epoxy.