I found two asphalt patching products online that are designed to be heated in the microwave. Both are out of stock. Can I heat up ordinary "cold patch" or "trowel patch" in the microwave?
Microwaves work by exciting the molecules in liquids that then trasfer their heat into surrounding materials. To be safe, "microwavable" products have water in them so that the water molecules are what heats up. If you use a product not designed for this, you could end up volatizing (vaporizing) VOCs (Volatile Organic Compounds) that are not only harmful, but potentially FLAMMABLE!