SeeAll and glue

zaitcev

Member
Joined
Oct 14, 2016
Messages
1,258
My prehistoric SeeAll popped the light collector. I reckon, all it needs is a dab of glue. But what glue is the most suitable? Both parts appear to be made of hard plastic, possibly acrylic.
 

Attachments

  • x90_seeall_bust.jpg
    x90_seeall_bust.jpg
    114.5 KB · Views: 23
Good quality super glue or acrylic specific glues are generally what ill use on that kinda stuff.
 
Yes, I'd look at super glues, aka cyanoacrylate glues.

There are some on the market that are a little thicker than the glues of the past, made for porous maaterials that may work better and placement of the glue bead is a bit easer that with the original, water like runny stuff.

It might require a bit of trial and error between brands and styes.

Follow the directions on cleaning a best you can.

Don't get the glue on your fingers.:)
 
I think it will be hard to glue that back so that it retains its original position, not just in terms of X-Y direction but tilt also. What popped off isn't just the collector, it is the reticle also!
If I was in your shoes I would reach out to the company and ask them if you can take them up on the discount deal they were offereng a while back, where people could mail them a MKI sight such as yours, and get back a MKII sight which is better in several ways. It is more compact and doesn't have a grub screw to mar your rail.
 
What Odd Job said. They might also be able to offer repair or at least advice on repair.

I hate cyanoacrylates (superglue) for anything optical. They exude vapors which will deposit on adjacent surfaces and therefore cause optical distortion or occlusion.

Also, cyanoacrylates have low shear strength and I am suspicious of the manner in which this attaches, worry it'll fall off under recoill immediately.

No... not sure what I'd suggest here if I had to do a repair, but likely something along the lines of G-Flex because of the dissimilar substrates.
 
I would reach out to the company and ask them if you can take them up on the discount deal they were offereng a while back, where people could mail them a MKI sight such as yours, and get back a MKII sight which is better in several ways. It is more compact and doesn't have a grub screw to mar your rail.
Probably not the worst idea.
But I didn't think of that, and asked if they can suggest a glue.
They replied with only one word: "Epoxy". Yes, that was the entirety of the reply.
 
Ha!

Okay, is it indeed glueing aluminum to whatever optical plastic? And the glue is not in the way of any optical systems so doesn't itself need to be perfectly optically transparent?

Then this:

It is very very good (strong, etc) epoxy, designed to hold boats together, but also specifically doesn't cure rock hard so doesn't pop off when two substrates do things like thermally expand at different rates.

Cures ever so slightly yellow if that matters. Apply otherwise as usual. Mix well. Clean and degreased. Clamp till time advised, leave to cure for a few days as per instructions, should be fine then.
 
I went with a formerly German glue, which I smuggled from another country. It's urethane dissolved in toluene. For some reason, it's not available in the U.S., but it seems to match the requirements. The urethane does not go rigid.
 
That sounds fun and now I am jealous. I have some very crazy urethane glue for repairing RIBs, but I was not able to steal the actual brand name Zeppelin glue from my one friend.
 
I am with Odd Job on this one but if you really want to try I would use a very tiny dab of Goop, Shoe Goo, or other brand same thing. Hard plastics don't respond well to super glue. It might hold for a time but will almost surely fail again. If you have a little squeeze out with those mentioned it is easily removed after curing for a short time. Most plastic cements work by melting into the plastic. I wouldn't want to do this with that sight.
 
Last edited:
I'd avoid super glue. Can/will make plastic cloudy. I'd just use some flavor of 2 part epoxy. A very small amount of it.
 
Super glue or any cyanide based adhesive will fog that lens up.
Personally I'd reach out to SeeAll either for advise or see if they'll do a good will repair.
If I had to pick an adhesive, I'd use Gorilla clear ( not the regular expanding urethane) glue
 
Back
Top