Hello to all I am new to this forum, and I need some help. i was just given a used spa it is a 93 cal spa, all works on it (pumps and heater). I did notice when we moved it that the bottom was damp, I am assuming there may be some leaks. The spa itself has no cracks, so once again I am assuming the leaks may be around the jets or the plumbing to them. The only problem is the spa has full insulation, I am curious if the insulation is removed to troubleshoot leaks, what do I replace it with. Any suggestion would help.

You can buy special cans of spray on insulation that is of the same density of the foam around the tub, but it isn't redily available and spendy. I just use the great stuff expanding foam sealant found in home improvement stores and it does the job just fine and nicely.