Roof Coffee Cup

Step 5 Attaching the magnets

Once you get the right pattern/arrangement, you need to attach the magnets to the plastic.  I use industrial strength hot glue, so when it's on my roof and the wind is flowing by, it doesn't lose any strength because it's cool.  When the magnets are secure, I like to fill all around them to make it almost one piece.  To eliminate any bumps or high points, while the glue is still hot/warm, I take a piece of wax paper, cover the magnets, and stick it to something metal magnet side down.  This flattens the glue, and the wax paper stops it from sticking to the metal.  It also helps you pick it up from one when it's cool.

Once cool, I run a razor over the magnets to make sure there's no glue on them, and cover the whole thing with electrical tape so the magnets aren't directly touching my car, and to reduce scratches .