I'm thinking about using Nitrate for the base on my next plane.  It's going to be a built up wing, at what point do you switch to butyrate?  I've read one or two articles where they said they used the nitrate to shrink the silkspan.

Thanks,

James

I apply nitrate to everything except the open bays.  I use nitrate as the entire substrate and for attaching the covering.  I also use the nitrate to begin the filling process on the solid wood areas.  I use Sig Supercoat (high shrink) clear to shrink the open bays, then go to Sig Lite Coat (low shrink) all over for the rest of the clear.