Hey there P-47--I use Solartex fabric exclusively and love it. The first thing you need to do is get some Balsarite or Sig Stix-It. Thin eiher of these about 15% with acetone or mek. (Balsarite and Stix-It are essentially the same product--I use them interchangably)
Brush a single coat over your framework--it will appear kinda thick and spotty after application but don't worry about it-it is heat activated and will flow out evenly under your covering when you iron it or use your heatgun. Let your Balsarite dry 45 minutes or so and you are ready to cover. Use the technique described in the Solartes instructions and you will enjoy it. Please read the thread I put under Kit building catagory titled tips for working with balsa sheeting and have fun. Besides ease of use the best thing I like about solartex fabric is that I can paint it to allow the fabric weave show through or I can come back with a clearcote and you swear it is plastic!!