On 02/07/2020 09:47, newshound wrote:

snipped

I can't see flame polishing working on perspex, the gap between
"no effect" and blistering the surface is vanishingly small.

Yet somehow it's done all the time and is quite easy. 'Flame polishing
acrylic' is a good search term. Perspex is PMMA is acrylic.

--
Cheers
Clive