Epoxy for dichro glass? Any warnings?

[telmnstr]

I'm closing in on building my first full RGB projector. I picked up 3 sets of dichros and 3 sets of holders from o-like to start with.

Any warnings about epoxies for holding the dichro glass in the holders?

I used to have lights that had hot/cold mirrors in them and somehow they were glued in there where temperature didn't seem to effect it too bad.

Is standard Wal*Mart 2 part epoxy okay?

[LaNeK779]

just don't use instant glue

as far as i understand, anything 2-part is ok.

[telmnstr]

Sweet! Thanks for the info! Will report back how it worked out.

[buffo]

just don't use instant glue

Exactly. Stay away from cyanoacrylate glue, which is sometimes called "super glue". (One very popular trade name is "Crazy Glue", and featured TV commercial where a guy puts one drop of glue on a small metal plate attached to his hard hat. Then he sticks the plate to a large steel I-Beam, and just seconds later you see him holding onto the side of the hat as his whole body is suspended off the ground. )

Super glue will bond in seconds, but it will out-gas for many months, and this material will end up all over your optics, eventually making them opaque. It's nasty!

as far as i understand, anything 2-part is ok.

Yeah. I like to use JB-Kwik myself. It sets up pretty fast (around 5 minutes), and so long as you don't use too much of it, you can break it free if you need to remove the optic at some point in the future.

Adam

[andy_con]

dont get any on the part you want to use?

[LaNeK779]

and don't glue it the other way around!!!

[andy_con]

Don't eat it .

[swamidog]

you beat me to it! curse these time zones.

Don't eat it .

[planters]

Methylene chloride (paint stripper) applied to cured epoxy will cause it to gel and it is easy to wipe off. I haven't had any compatibility problems with glass optics or their coatings. Epoxy is very strong so you need very little. It is convenient to apply it as an accessible fillet or drop on the edge of the optic that links the optic to the mount as opposed to a wide-spread layer covered by the optic that makes access and removal much more difficult (often involving heat).