Casting with Polyester resin question

[tk1565]

Hey guys
hoping someone can help with a question on casting with polyester resin?
iam have'in problems with veins in my pulls can anyone suggest a cure for this problem? Tried heating with heat gun Out of mould but not clearing up the veins?
any suggestions welcome please?
Tk..out

 

[exoray]

Polyester is not a casting grade resin, especially for thick or large parts...

You can try using less catalyst so that it produces less heat on cure, cut your catalyst amount in half and give it twice as long to cure...

 

[tk1565]

Thanx mate
will give your suggestion a try.
What materials are suitable for clear casts other then polyester ?

 

[BGHUNTER]

WhAt are you casting , how are you casting (method) what is the name of the produt you are using and what material are the molds made from?

 

[tk1565]

WhAt are you casting , how are you casting (method) what is the name of the produt you are using and what material are the molds made from?

Hello
Iam casting a resin piece,it worked great for pulls with other material excellently,material for mould is platsil 71-20 from polytec
and polyester resin is castin'craft clear ,I added color that is castin craft pigment. :confused
Tk..out

 

[fettster]

Polyester resin shrinks when it's cast so it might be that the resin is shrinking away from the surface of the mould whilst still wet as it will cure from the centre out.

You could try a clear urethane resin, opticlear is great from polytek. Or try casting it in several thin layers rather than all at once

 

[robn1]

Castin' Craft isn't the best resin, and it can be difficult to use. It's possible to get good results with it though. Follow Exoray's advice, Castin' Craft's instructions say to use less catalyst with larger pours. Also it has a weird quirk, any resin exposed to the air in an open faced mold will be tacky, and never seems to cure. They make a curing additive to apply to the exposed area to allow it to cure.