All the bases seem to have been covered here, but for what its worth, heres how I've been doing it since the mid 50's.. Mix a thin paste of flour and water, cut the tissue to approx. size, smear the paste onto the edges of the surface to be tissued, apply the tissue working from the centre out to the ends to get it as tight as you can and allow the paste to dry. When the structure is covered and the paste dried, trim the edges and stick 'em down, then mist spray the tissue with water, this will shrink the tissue. When dried, take it outdoors and apply 2 coats of thinned dope to seal the tissue. Maybe a VERY light sand before painting. My Dad taught me how to tissue cover model planes, he was born in 1914 and an aeromodeller all his life.........John