If you start to see gunk stuck in the adhesive (cat hair, human hair, your lunch crumbs, etc.), then it’s time to put new adhesive on your polymer plate. This should be a pretty easy process but does require a little muscle.
First, peel up the old adhesive to remove it. You’ll need some good fingernails to get between the adhesive and your plate. Since the adhesive holds onto the plate strongly, you can potentially kink the plastic backing if you’re not careful. We recommend that you lay the plate face down on a flat surface. Hold the plate down with one hand while peeling the adhesive off with the other. Try and keep the plate from flexing inordinately while you carefully tug the adhesive off the back of the plate. The adhesive might tear into pieces, but you can simply pull it up in strips.
Now, put on the new adhesive. If you have purchased a 12” x 18” sheet of adhesive, lay the blue release paper on a flat surface and have the brown silicone paper side face up. You will remove this silicone paper to show the sticky adhesive. If you have a roll of adhesive, pull out or unroll the adhesive so the sticky side is face up. When you first mount the adhesive to the plate, start with one side or corner of the plate and lay down the plate to the adhesive so that it makes as few air gaps or bubbles as possible. If the bubbles happen, work them out with your fingers or pierce them, through the back of the adhesive, with one prick of an Exacto knife or awl. You should be able to get all the bubbles out at this point.
If bubbles form underneath the plate when you mount it to the base, first try working these out to the edges of the plate with your fingers. If that fails, you can puncture the bubbles by sticking an Exacto knife through the BACK of the plastic backing of the plate (the blue side) to release the trapped air.