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Originally Posted by freebeard
Does the doping and paint rigidify the surface or does it remain in tension?
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Both. Dopes continue to shrink some after drying until it looses plasticity in the sun and cracks, the modern synthetic finishes don't shrink as much but last longer. You can apply decorative coatings, films or decals that aren't structural. Any paint thickens the surfaces and makes it slightly more rigid than bare. Rigid is a benefit, not a requirement. Common to see warped surfaces after a while of sun exposure. Still cant walk on a fabric surface without ruining it.
You don't want floppy fabric, suspect drumming from looseness is kinda fatal.