In article , Richard J Kinch wrote:
IanM writes:

Otherwise the 'gold standard' mould release
for fibreglass work is PVA (PolyVinyl Alcohol - NOT white glue!) and if
you know anyone in the trade you may be able to beg a little bottle
full.

Polyvinyl alcohol used to be sold as a hard contact lens wetting solution.

No, not really. PVA was one ingredient, but by no means the entire solution.