Join Date: Jan 2011
Location: Calgary Alberta Canada
Where the double sided tape will contact the inner surface of the tourpak, give those areas a sanding with a 80-100 grit sandpaper, vaccum up any sanding dust from the surface when you are done. Don't test the roughness of the surface with your bare hands, that will introduce oils from you skin onto the surface impeding the bond.
Plastic oxidizes. You just don't see the results of the oxidization like you would with metal. Sanding the surface does 2 things. It increases the actual surface area for the tape to bond too and it removes the surface laitence layer of oxidized plastic.
Use isopropyl alchohol to clean the prepared surface and let it dry completely before applying the tape. Press the tape into the prepared surface so that it gets a good hold on the scratched surface. Let the tape "cure" for approximately 24 hours before you re-attach the liner. If you can, shine a trouble light onto the inside of the lid onto the applied tape. The heat will help cure the glues in the tape. You don't need a lot of heat, just make sure it is warmer than the surrounding areas, a difference of 10-20°F will help to force cure the tape.
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