Anyone pre-treating their balsa skins prioir to lamming.
Seem like balsa not only sucks alot of epoxy but also releases gas to cause airbubbles/pinhole during hotcoats.
I know there’s cheater techniques to fill the weave during lamming to reduce pinholes during the hotcoat/2nd coat but has anyone experimented with selaing the balsa to reduce resin absorbtion during the lam/vacuum session?
Some have said alcohol or ammonia washes and I see that woodworkers have had for many years a variety lacquer rubs or sprays like
MYLANDS sanding sealer
HUT Crystal Coat
GENERAL Poly/Acrylic Sanding Sealer
some say you can even use CA-based glue to seal the surface to reduce resin absorbtion.
It seems like the dryer you can keep the balsa the better off you are versus having your vacuum permeat the wood grain with epoxy through it’s structure. Strong yes, but also heavy.
So is the routine to ultimate lightness…
Spackle the EPS to seal
Seal the balsa and them lam them seperately under high pressure to build out your skins before applying them to the blank
and use “hardened” rails of Dcell,Corecel or balsa to fasten your skins to without wrapping the rails liek we do…
To stiffen and support use internal “springers” of the denser material used on the rails or other type of wood or petro chemical material…
By the way…
anyone use stainless steel or aluminum stips as an internal “springer” between the skin and the foam?