Ha! Experimental Setback. I tried to improve the seal on #1 Piano-36 with Ultra Black Gasket Maker (in a tube). Although I followed curing instructions, it stuck the back on so the melodica could not be reopened without destroying the gasket.
A new gasket could be created with Ultra Black, and I may try that, but I’m pessimistic about results. Has anyone tried silicone gasket tape such as this product?