Not bad but a little tricky to install if you're not careful. First, make sure you give the area of the tank you are installing it in at least twice a thorough cleaning to ensure it is free of any dirt or debris. After complete drying. Unroll the panel(s) completely (note the green and red ridges - it looks like the instructions) and then measure and cut. When placing, I've found that using a credit card/flat card to remove any air bubbles (same as putting a screen protector on the device) gives the best fit/seal and best results. This prevents build-up a bit, but you'll have to stick with your normal cleaning routines for the most part.
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