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A strong epoxy like BSI 5-15 min works great for me. I use it to bond high power rocket fin halves printed from PETG:


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You are correct, you can over cure a print by leaving it out in the sun. Prints can even over cure just by the ambient light in a room from the sun (though it would take a while). One easy option to counter this krylon UV-Resistant Clear Coating which can be found at most hardware stores. I have used it but I found that it made my print a little softer this ...


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The problem is probably the UHU glue having not had the time to cure through and interacting with either the PLA, the moisture in the garage, or the brick-paper's covering foil. Many of the metal-tube UHU glues - like "UHU Hart" - are resin-based and contain solvents that can interact with some polymers like the coating of the brick paper. Curing ...


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