I don't know of anything that would produce noticeable texture, that would stand up to flexing, temp changes, and humidity changes that a coach sees.
Have you tried filling a divot and leaving the filler "proud"? i.e. sticking slightly above the surface. After it dries completely, sand it down flush.
I notice on drywall that the filler always shrinks, so if I use a putty knife to fill it in, and scrape flush, then it will be slightly recessed when it dries.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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