Rejuvenating diamond hole saws

[Joe Rice]

Just drilled my first few holes in a few tanks recently and noticed that the bits seem to dull fairly quickly even when kept wet. Well, according to this guy, the diamonds on the bit get "glazed over" and can be rejuvenated by following the procedure in his video below. I can't vouch for it but thought folks might find it interesting.

 

[Bevans27]

Any diamond blade, hole saw in your case, is able to be run through concrete briefly in order to re-expose the diamonds. This is common practice on diamond rotary blades we use in the fire department.