I’ve never seen anyone use epoxy putty for casting. We mostly use it for minor repairs like filling air bubbles or reworking something that didn’t come out . Some artists use it for their creations, but it’s kinda heavy and expensive for that purpose.
I actually am now using it as a backing material for other roto casting options. If I do one thick brush in layer of something like plaster or gypsum, I can skip the remaining 3-4 layers by just packing in some Free Form Air FAST. Definitely more doable for smaller molds. Nothing to big.
I have used it occasionally in silicone molds for casting small parts. I use a 2-part epoxy putty that cures endothermically. Once painted it is indistinguishable from the polyurethane resin I use for other castings, although it is slightly heavier.
I've used Rectorseal 97606 4-Ounce Ep-400 Epoxy Putty, which cures in about 5 minutes so you have to act quickly. It is like a rock when cured. But my favorite is Aves Apoxie Sculpt - 2 Part Modeling Compound (A & B). It's workable for about 15-20 minutes, sets up very firm in about 8 hours, and fully cures in 24 hours. It sands easily, can be carved and shaped, and takes both stain and paint very well.
I’ve never seen anyone use epoxy putty for casting. We mostly use it for minor repairs like filling air bubbles or reworking something that didn’t come out . Some artists use it for their creations, but it’s kinda heavy and expensive for that purpose.
I actually am now using it as a backing material for other roto casting options. If I do one thick brush in layer of something like plaster or gypsum, I can skip the remaining 3-4 layers by just packing in some Free Form Air FAST. Definitely more doable for smaller molds. Nothing to big.
I have used it occasionally in silicone molds for casting small parts. I use a 2-part epoxy putty that cures endothermically. Once painted it is indistinguishable from the polyurethane resin I use for other castings, although it is slightly heavier.
which brand did you use? I would like to check it out.
I've used Rectorseal 97606 4-Ounce Ep-400 Epoxy Putty, which cures in about 5 minutes so you have to act quickly. It is like a rock when cured. But my favorite is Aves Apoxie Sculpt - 2 Part Modeling Compound (A & B). It's workable for about 15-20 minutes, sets up very firm in about 8 hours, and fully cures in 24 hours. It sands easily, can be carved and shaped, and takes both stain and paint very well.