I've used both tautening, and non-tautening nitrate. The "non" is better on light built-up structures. I use the tautening on sheeted models that are covered with tissue, or silk, but I clear coat all of my glow fuel airplanes with Klasskote clear. My electric models are covered with colored tissue and brushed on nitrate, and that's all. I get lazy on "open bay construction", so most of my built up components (like wings) are covered with plastic film. Note that non-tautening nitrate is often sold with a blue dye to distinguish it from regular nitrate, so if yo plan on the color of your silk, or tissue to show through, then you want to get the non-tautening without the dye.