Hi Gerrie
To put silk on balsa, I used nitrocellulosic liquid. I fix also silk in different points like leading edge, tips of wings, with glue. I don't have ratio, you mix the talc with nitrocellulosic until it's good to put it with a painbrush (like a gelcoat). You have to put paste and sand it several times to obtain a good finish.
Link with pics how to put silk and talc
http://f3a.sakura.ne.jp/radiocontrol...uster0628.html
http://f3a.sakura.ne.jp/radiocontrol...uster0823.html
link to translate japanese language to english language
http://www.excite.co.jp/world/englis...=JAEN&wb_dis=2
somes pics for example (he's not me)