question about plaster...

[Hecubus114]

can plaster of paris be added to already cured plaster of paris? As in - I started a mold but didnt have enough plaster -can I just add more tomorrow?

 

[clonesix]

Yes, but rough it up a bit to get a bite on the old plaster, and wet it down real well, so the old plaster doesn't suck all the moisture out of the new plaster.

Plaster of Paris is the weakest gypsum product to make a mold with. Consider something stronger.

 

[JtotheP]

Yes, but rough it up a bit to get a bite on the old plaster, and wet it down real well, so the old plaster doesn't suck all the moisture out of the new plaster.

Plaster of Paris is the weakest gypsum product to make a mold with. Consider something stronger.

Agreed--If you don't get anything stronger, try adding burlap strips soaked in your plaster or fiberglass rovings to add strength.

 

[Great_Bizarro]

Use hydrocal or ultracal when you have the choice.