My loco’s windows are 3D printed plastic with rebate for the glass, cut from large microscope slides 1 mm thick. Multiple specks of superglue have let go after a couple of months which is about what I expected. I considered silicone but it is stringy and I couldn’t apply small enough blobs. Any recommendations?

Thanks for your suggestions. I had a look through my glue/sealant collection. The most promising is a clear contact type shoe glue. It doesn’t string too much so I should be able to apply some specs. I am reluctant to buy something special for about the 100 microlitres I need. I had never heard of pinkgrip nor have I ever used hot melt glue.
new frames are not an option. I went to an invitation weekend at another club and a bloke was demonstrating his 3D printer, making novelty objects. I asked him if he wanted a real job and he was quite keen. The next day I went with my design and he printed the frames in suitable brown plastic. On display were two almost finished rebuilt Merchant Navy locos so I was able to indirectly return the favour by giving the builders a stack of the large glass slides for their windows.