Concrete casting with rubber molds: planters, pavers, countertops

@moldmaker_mina · Oct 9, 2026 · 1.7k views · via Smooth-On ↗

Urethane rubber molds last for hundreds of concrete pours. This section covers mold rubber choice for concrete, release, and demolding without chipping edges. Pairs with the GFRC planter write-up below.

#concrete#casting#urethane#mold-making#planter

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@applianceandy 11d ago

Tried this over the weekend and it worked first time. Thanks for writing it up properly.

10
@sparky_sal 12d ago

Would this work on the older model? Mine is about ten years older than the one shown.

9
@moldmaker_mina OP 11d ago

Should be the same procedure, the part moved slightly but the steps match.

5
@benchtop_bea 11d ago

Upvoted for the safety notes alone.

9
@moldmaker_mina OP 11d ago

Unplug it. Always. Takes two seconds and the worst case otherwise is a trip to the ER.

5
@solderpunk 10d ago

Great find. Did not know this channel existed.

9
@voltbike_val 11d ago

Tried this over the weekend and it worked first time. Thanks for writing it up properly.

2

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