I have tried the "fixa flat" repairs on a/c and fridges. On a/c units if you don't do it correctly, you will lock up a compressor. Trust me when I say the directions are wrong. I bleed it through my gages, bypassing a small mixture of liquid Freon, making a flush thru. Using exact direction, I always lock a compressor in 30 days. On fridges, if the condenser fan drops out and you get a high temp problem. The lacquer used to seal the windings will release moisture and plug up the cap tube system. We won't even recommend any leak repair product now. UV dye, electronic sensor, and good ole soap bubbles, and a lotta patience, you'll find the leak.