I just bought 4 mats of 4' x 6' from you. It is for an indoor gym I am making in my garage on concrete floor. Do you recommend that I get some glue to lay it down?

You don't have to glue our mats down when using them as a gym floor. If you want, you can glue them down with one of our polyurethane glues, or you can use our Double Sided Carpet Tape for a less permanent install. If you want to create a more water resistant install, we would recommend using our Seam Sealer glue along the seams of the mats. Depending on the type of mat purchased, you may need to also apply our Rubber Floor Finish and Sealer.