What coating/product could impermeably seal a tyre?

[brotherharry]

I have an idle scheme/shed project to take a used tyre and convert it into a bit of furniture, side table/foot stool etc.

Thing is, I rather suspect that the thing will reek of rubber and hence not be entirely conducive to use indoors.

So my question for help/advice is - what sort of compound/product/coating could I apply to the rubber which would permanently and impermeably seal it such that it would not give off the rubber vibes?

Any ideas?