Posted Wednesday, September 30, 2009 @ 01:21 PM
Be careful! in the overlap you don't see the bump while you have the surface sanded and everything is dull, but when you paint it you will see it.
For that reason before overlapping you must scarf the first coat and when you finish you must fill the invisible step and smooth the surface. For that reason the overlap must always be in a place where you possibly don't see it, i.e. the lower part of the leading edge or under the fin. The same is with fabric.
You can make the stabilizer in two coats, first the bottom then the top, it is possible without becoming mad.
The fuselage can be done in two too, first one side then the other one. Remember to overlap only after cure of the first coat and subsequent scarfing.
Answering to Jorgen, the plasticizer is added to the poliurethane enamel (or the primer or the dope) in reason of 5 to 10% before using it. As far as I know it is a vegetal oil like banana oil or castor oil, but I never did the experiment since I used a Du Pont product.
Now I'm also in the process of preparing the Nitrate glue by myself with basic components. The glue is based essentially on Cellulose Nitrate + Acetone + Plasticizer and costs about 1/10 of the cheapest glue you can find on the market.
Eugenio
