I have a "lower end" spa that sits out on my outside deck. It seems to have very little insulation because during our "harsh" Fall and Winter season down here in Louisiana (lol) the spa just can't seem to hold the temperature long. It always kicks on and cycles to bring the temp back up to wherever I have it set. I use to have a Colman spa and I do not remember the temperature fluctuating like this! I know you get what you pay for, I have a DreamMaker portable 6 person spa. When I empty the water out and tip it up I do not notice a whole lot of insulating materials. I am tempted to go to Home Depot and by that expanding foam and spray that stuff all underneath up along the underside of the tub to give it some insulating properties. I can get way up in there so I could cover a lot of area doing this, I really don't care what the underside looks like as long as my water temp holds better. Also, I do have a standard cover but was thinking about getting a floating blanket also.HELP?