[DavidT]

Hello all. I’ve just started working with Polyester Resin and am working ongetting the mix right. The first time I had a pretty nice surface but it stayed tacky for ever. I added a few more drops of catalyst and it cured much better but I had more of this look. https://imgur.com/ZRkirol It is only on the surface and can be scraped off. The inside is crystal clear. Is this due to too much catalyst or something else? I use a pressure pot at 50psi for a solid 24 hours.

Thanks!
David

[Katherine Swift]

Hi David,

I’m sorry to say, but the surface exposed to air will remain tacky after curing. I talk more about it here:
https://www.resinobsession.com/resin-resin-resin/polyester-casting-resin/

[DavidT]

I’m good with the tacky issue (and have bought the finishing spray) but the weird looking surface is from the bottom of the mold.

[Katherine Swift]

It may be that your resin got too hot and shrank during the process.

[Author]

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