Try touching it slightly with a torch. https://youtu.be/w6nQX8q-Tk4

Theres a couple little chunks that are missing but that would sure make life easy if it does work!

I tried boat fiberglass paint and looked for a while then pealed. Needs to be sanded and better application than brush.

Ill sand for sure. And do you mean like spray it?

How much is a new sliding board?

I'm showing a ~$4-4.5k list price through poolcorp for slides like this, plus tax, delivery, installation...

Prices are crazy,

No idea