There are epoxy putties that are pre colored black or intrinsically a dark gray,
Mohawk makes a black epoxy putty that I've used ( also in other wood colors )
it's a specialty item so you'll have to look for it at woodworker supply houses.
Plumbing supply is another place to look.
I believe JB Weld makes a dark gray putty, Home Depot etc.
It may be harder for tenderobject to find such things, because of where he is,
but I could be wrong
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