From my Free Flight days: 1965-1985 --
Genuine JapANESE tissue is hard to find these days. If you can find some, it is applied dry. Esaki brand is (was?) the best, but unfortunately no longer manufactured. Some Free Flight sources (Peck Polymers, et al.) sell reasonable substitutes today. The "good" stuff should have a shiny side and a definite "grain" direction.
Sand your framework, then apply 3 coats of dope, sanding between coats except the final one. Lay tissue over framework, shiny side up, grain spanwise, pull as taut as possible, then apply thinner thru the tissue, which softens the dope and adheres the tissue. When dry, trim edges with a new razor blade, then rub thinned dope thru the edges to seal it.
Shrink with a light mist of isopropyl alcohol or 50/50 water/alcohol. When dry, apply multiple coats of 50/50 dope.