Glue for glass to plastic

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?

Hot glue gun?

Contact adhesive?

Re-make the windows with a couple of ledges, to at least reduce the held edges (to combat expansion/contraction?

pinkgrip

The glue used to stick rear vision mirrors onto windscreens may be your savior as it exactly fits your criterion of plastic onto glass. The only possible hiccup is the type of plastic in your 3D prints and whether the glue is compatible.

Pero

In a similar vein to Pero’s suggestion … I would try using one of the LOCA UV-curing adhesives that are now so widely available.

MichaelG.

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.

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With respect, Simon …

that does seem to make it rather pointless asking for recommendations.

MichaelG.

Indeed. How about using the silicone you avoided but masking off all the unwanted areas it may contaminate prior to application using a low tack tape?

pgk

Slightly unfair, as ndiy suggested contact above, and having got it out and tested it, it is what I will try next.
Silicone and masking tape (Tamiya is suitable) is a good idea. Fiddly but very doable. Glue failure results in the windows falling into the cab, rather than into the ballast, so it’s worth trying something I have first.
On a related subject, I had a tube of black silicone gasket sealant for 30 years and it finally ran out. I bought a new tube and the whole tube set solid after one use. Why? Not cheap either.

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I will say no more on the matter then

MichaelG.