Brett,



My recommended approach is to cut a rectangle out of the floor of the cage. Make the rectangle 2" longer and wider than the heat source you'll be using. Don't cut it to close to the cage walls to avoid affecting the structure and/or coming close to screws or other fasteners.



Then go ahead and seal the entire cage with whatever you choose, including the floor.



Next cover the entire floor with Sintra or other brand of expanded PVC. This makes the cage easy to clean, durable, and increases thermal mass, which is a good thing with flexwatt. It also transmits heat very well. Make sure to silicone the edges.



The flexwatt can be attached to the underside of the plastic with the appropriate foil tape. Route a groove for the cord to run out the back.



Regarding TAP Plastics mentioned in the other post, they make and distribute good stuff. The marine epoxy can be a pain to work with and offgas for a long time, but the finish is very durable.



Another word of warning is that some marine epoxies can yellow over time. But there are numerous types of epoxies so read up and see what the particular product is known for.



I'd be more inclined to use TAP's polymer based bartop epoxy, assuming they still carry it.

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