Originally Posted by rsdata
I don't have experience doing that, but I have heard that you can heat the tape with a heat gun to peal it off, or alternatively, cut the eternabond tape ( a skylight) at the edge with a razor knife, replace the skylight unit, then merely tape over like you did the first time you installed the tape... after all it is eterna-bonded to the roof.
This would be similar to installing the tape directly over newer ( in good shape) caulk, without trying to remove the caulk first.
I have successfully removed Eternabond. The skylights on the slideout were simple 1/16" sheets of 24"x24" polycarbonate. Cherokee had placed butyl tape under the sheets, screwed them down, and then taped the entire perimeter with 2" Eternabond. After 11 years, both skylights had yellowed and become brittle. When a flying pine branch went through one of them, it was time to replace them.
I used a heat gun and a very dull 3" scraper (putty knife) to remove the bulk of the Eternabond. (The scraper had previously been used to remove paint from a concrete porch so it had no sharp edges or corners.) Then I scrubbed the surface with mineral spirits to remove the residual adhesive. This left the surface with a slightly oily feeling. Per RSdata's recommendation, I followed up with an alcohol rinse which left it dry for a good bond with the new polycarbonate (1/8" this time) and Eternabond. I omitted the screws and butyl tape and still achieved a watertight seal.
I would say that the Eternabond and the butyl tape were about equally tedious to remove. Both needed the heat gun, scraper, and mineral spirits.