I remember many years ago, on my 1/4 scale Decathlon with the red and white sunburst design, I painted the airplane red (fabric and dope), the paint was acrylic enamel and the surface was very slick, all the white trims (and there was a lot ot them) was done by using Monokote cut to size, water with a tad of soap mixed was sprayed, lay the monokote down, the soapy water allows you some time to either move it around a bit or just to lift it up completely, once in place, squegee all the water from under the trim, from the center out, using your free hand to keep it still, not an ait bubble is left under the material, next day, after the water and soap have dried out, clean the edges, and in this particular case black 1/4 inch trim tape was applied all around the perimeter of the white trims, thus sealing the edges, the entire finish was afterward completely sealed with clear urethane, but if some monokote sealant is applied, that should keep those edges from lifting up under use, or just seal it with a good trim tape, like Goldberg's, the problem is that if you use heat, whatever air might be trapped under the covering is going to expand creating a very ugly bubble.