Has anyone tried Sugru?

For camera eyepieces, PlastiDip works well, paints on like a thicker paint, dries rubbery. And, it will peel off easily if needed.

I've also used ShoeGoo black, for repair of athletic shoes, rubbery, but it can get really messy trying to apply it.
 
For camera eyepieces, PlastiDip works well, paints on like a thicker paint, dries rubbery. And, it will peel off easily if needed.

I've also used ShoeGoo black, for repair of athletic shoes, rubbery, but it can get really messy trying to apply it.

I was about to try PlastiDip just before I found the Sugru. I bought some at one time but the owner of a local camera shop applied some silcone material to a IIa and I ended up returning the unopened product.
 
Something that has occurred to me as a possibility is to take some felt or rubber material of 2-3 millimetres thick. The sort which is used to make the little stick-on furniture protectors (typically placed on the bottom of objects d'art to protect furniture from being scratched) would be possible sources.

Then if you can find some appropriately sized hole punches (available in hardware and craft stores, often in sets) you could punch a smaller hole equivalent to the size of he rear finder lens and concentric with, it a larger hole to create the final "donut". This would give you a soft protector which could be glued onto the the metal surround of the finder - perhaps with silicone which holds quite securely but can be removed if needed. This arrangement would allow new protectors to be installed when ever they need replacing or if the old one is lost.

I have all of the above and should try it but have not bothered as I typically shoot without my eyeglasses and using a screw in diopter to correct for my eyesight.

Peter, I can't see past the end of my elbow without glasses. My prescription lenses are expensive and I've already replaced one set of lenses because of scratches. I can see the rangefinder patch without glasses but everything else is just a blur. It's something I have dealt with for my entire life. One of the many things I like about this site is learning about what works from the members who have tried a lot of stuff that didn't work. This is really just one more option.
 
I suspect a laser cutter would be the ideal solution for creating the shape/size needed, if we could find a material that wouldn't catch fire or stink up the place during cutting. It also might be possible to 3D print a shape that would snap onto or slide over the original eyepiece, and be just small enough to stay in place with very little adhesive. The (few) 3D printing projects I've done use a plastic material that has a slightly flexible, waxy finish that probably wouldn't scratch eyeglasses. Anybody got a 3D printer?
 
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