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  • Members
Posted

Before bonding a rubber outsole to a leather insole I sand the leather on the flesh side to, apparently, improve the bond. Has anyone observed whether the sanding stage is actually necessary?

Thanks.

Scott

  • CFM
Posted

I do not sand the flesh side but if I am gluing anything to the grain side I sand or otherwise 'rough' it up. To give the adhesive more to bond to. There should be enough 'roughness' on the flesh side.

Hoka Hey! Today, tomorrow, next week, what does it matter?

  • Members
Posted

Roughening surfaces before gluing is always a good idea.  That holds true for lots of materials, including concrete, for example.

Regarding leather specifically, it is super important if the leather has a finish on it that might diminish the bond strength.

It doesn’t take a lot of time to properly prepare leather for best adhesion.  Better to be safe than sorry applies here.

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