Based on other reviews, I thought this flooring would be a great alternative to spending quite a bit more - I wish I would have just spent the money instead of wasting my time and money on this flooring. I applied over cement base, using the adhesive primer. I followed every possible direction to try and get these squares to adhere and they never did properly. The flooring looks a mess, and I am so full of regret. The customer service was pretty great I must say; I just wish things would have turned out differently.