This silicone rubber kit is comparable to others I have used. It's easy to mix and starts to harden in about 20 minutes. In other words, if you mix, if you keep mixing, it will start to thicken after about 3 minutes, but it can be used for another 20. I want to be sure to water ahead of time to allow the bubbles to dislodge. In this case I don't see any captured bubbles and see a lot of post-fill activity. Depending on your project, you may want to apply some tape to ensure there are no bubbles. Very good detailing, durable and reusable molds. Prices are similar to other products. 5 Stars.
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