Instruct: Classify Amazon reviews into positive or negative sentiment
Query: buyer beware

Before you purchase this product I HIGHLY reccomed you call Dexpan. No where on Amazon, the instruction sheet or packaging warns you that this product can not be used on materials LESS THAN 6" thick. Unfortunately I found this out only after renting the drill and 1.5" bit, purchasing 2 11# units of dexpan and drilling 100+ holes in a 4'x42'x4" driveway "apron". Had I known this prior, I obviuolsy would have gone in a different direction and not waited for 7 days for the product to do it's "magic". However, I can say that if used in materials AT LEAST 6" THICK, it will do the job for sure. I have requested a full refund which Dexpan says they will happily provide.If I in fact receive the credit (close to $100), I will use this produce in the future shoudl I have right project.