Curing - Free Form™ SCULPT will reach full properties after 24 hours at room temperature. Cured epoxy is waterproof and can be sanded or machined. If machining or sanding, wear NIOSH approved particulate mask to prevent inhalation of particles.
Painting – Cured Free Form™ SCULPT can be primed and painted with acrylic enamel paints. Let paint fully dry before handling.
Heat Resistance – Fully cured putty with a minimum thickness of ½” (1.27 cm) will resist temperatures up to 150° F / 65° C.
Removing Uncured Free Form™ SCULPT - Remove as much uncured material from the surface as possible. Clean any residue with soap and water.
Optional -
Use E-POX-EE KLEENER™ available from Smooth-On.
Shelf Life - In an unopened container, at 73° F / 23° C, shelf life is 2 years. Use entire contents as soon as possible after opening.
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This is from the site page info on the Free Form Sculpt. Says it's waterproof, which makes me think it wouldn't leach into the water, but Unsure.
I'm thinking if it's truly waterproof I could sculpt something with wire or metal as a base, making it much easier/sturdier and could create custom shapes really nicely. I'm mainly thinking of using this on parts of my scape, On something like arches and ridges and small ledges. I do want to incorporate some Stax Marco Rock.
Also in the safety data sheet it list all the products on the same sheet. I think I'll give them a call and ask some questions about it.