Question 1

Is there a shelf-life for this product?

Accepted Answer

I bought this in 2016 and only used a small amount to make a test sample. Last week (early Feb 2022), I used some of it in a 3D printed mold to test the viability of using 3D printing to make molds, using this as the casting medium instead of the mold medium and it worked almost perfectly. This was the first time the two bottles were opened since 2016. So although the RATED shelf life is about 6 months, if kept sealed in a cool place you may find it still usable as long as SIX YEARS later. YMMV, of course, but it speaks to the quality of Smooth-On's products that they remain viable for so much longer than they really should.

Question 2

Is this product compatible with acrylic paint?

Accepted Answer

Probably not.  It's very flexible as a finished product.  While you can probably paint it with acrylic, if the item you are painting is to be moved around or played with, the paint will probably flake off.  This item would need to be "Colored" with silicone based pigments.  The Rebound is naturally orange in color once mixed, so it will take quite a bit to cover the orange base.

Question 3

Could I pour this into a plaster mold to make a soft casting of a footprint impression?

Accepted Answer

Certainly!  This would make that soft casting of a footprint very easily.  Just remember it is orange in color, so if the end color of your casting is important you will need to add silicone coloring to the base before it sets up.

Question 4

Can this be casted into a mold?

Accepted Answer

It might work, but it is not a good choice for casting. It is very viscous, so it would probably trap bubbles , especially if you have undercuts, or anything strange in the geometry. However, every time I have leftover silicone in the plastic cup that I mixed it in, it always makes a perfect negative of the cup when it cures (including the letters in the bottom), so if you have a convex mold it should work.

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Smooth-On Rebound 25 - Brushable Platinum Silicone Rubber - Pint Unit

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