What's the shelf life?

idk. i used for one key the lost the bottle it’s been a while!

does this work on leather to leather?

I can only say it works great for reattaching piano keys (after everything else I tried failed). There are other glues on Amazon specifically designed for leather (E.G., Aleene's Leather & Suede Glue or Fiebing's Leathercraft Cement). Unless you also have a piano you might want to use this on, perhaps better to go with one of them.

Does this need to be tinted with titanium dioxide? Also, does it need a white linen cloth between the wood of the key and the bone covering?

It is clear. As for the linen, I don't know if it does, but I bet that is the right way to do it. I had some pop off after gluing. Maybe that is why.

Can I use it to glue ivory keys on piano?

I have used it to replace the key tops. They are not actually ivory anymore but a hard type of plastic. The glue works well.

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GEMM Piano PVC-E Glue - Excellent Adhesive for Piano Keytops, Felts or Leather Material (2 oz)

Product ID: 36113989

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Details

Brand
Gemm Piano
Specific Uses For Product
Woodworking
Material
Polyvinyl
Compatible Material
Wood Plastic
Item Form
Liquid

🎹Dries Clear

📏Multiple Sizes

🔗Excellent Adhesive

Description

🎶 Stick with the Best!

EASY TO USE - User-friendly formula for quick and effective repairs.
SIZE VARIETY - Available in sizes from 2 oz to 128 oz to suit all needs.
UNMATCHED CLARITY - Dries crystal clear for a seamless finish.
VERSATILE APPLICATION - Perfect for key covers, cloth, felt, and leather.
TRUSTED BY PROFESSIONALS - The #1 choice among piano technicians.

GEMM Piano PVC-E Glue is a high-quality adhesive specifically designed for piano keytops and various materials like felt and leather. Available in multiple sizes, this glue dries clear and is favored by piano technicians for its reliability and versatility.