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Glue for glass to plastic

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Simon Collier05/06/2022 21:31:19
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480 forum posts
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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?

not done it yet05/06/2022 21:48:58
6889 forum posts
20 photos

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?

Ady106/06/2022 01:40:01
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pinkgrip

Pero06/06/2022 04:14:51
163 forum posts

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

Michael Gilligan06/06/2022 06:10:31
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20289 forum posts
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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.

Simon Collier06/06/2022 06:34:51
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480 forum posts
63 photos

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.

Michael Gilligan06/06/2022 06:52:06
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20289 forum posts
1064 photos
Posted by Simon Collier on 06/06/2022 06:34:51:

[…]

I am reluctant to buy something special for about the 100 microlitres I need.

.

With respect, Simon …

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

MichaelG.

pgk pgk06/06/2022 07:46:13
2605 forum posts
293 photos
Posted by Michael Gilligan on 06/06/2022 06:52:06:
Posted by Simon Collier on 06/06/2022 06:34:51:

[…]

I am reluctant to buy something special for about the 100 microlitres I need.

.

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

Simon Collier06/06/2022 10:53:30
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480 forum posts
63 photos

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.

Michael Gilligan06/06/2022 13:56:59
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20289 forum posts
1064 photos
Posted by Simon Collier on 06/06/2022 10:53:30:

Slightly unfair …

.

I will say no more on the matter then

MichaelG.

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