I've noticed that the adhesive backing seems to hold better on the non-waterproof strips compared to the waterproof strips. Have especially experienced this problem after removing a strip from its initial mounted position (on aluminum, etc.) and then remounting it to another position. Believe it or not, I use the permanent Scotch (3M) double sided tape (easily found on the office supply aisle of most stores) as a cheap fix. This tape has been durable and held up well (sticking very good even with the heat, and doesn't seem to effect heat transfer). Only drawback is when you remove the strip again... the adhesive that remains on the mounting surface is a bear to remove (goo gone does the deed, though).