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The best product on the market to use for reflective material for grow room or grow box is: kool seal elastomeric roof coating! It's everything you would want in a cheap and affordable reflective material.

I have made many a grow box and I have found that using Kool Seal Elastomeric roof coating works the best! It is a premium white coating which reflects 90%+ sunrays. Not only does it have that amazing feature but it also resists mildew & algae. It helps to absord sound (like fans or blowers) and...