On 22/02/17 23:28, The Natural Philosopher wrote:
On 22/02/17 22:04, TimW wrote:

[...]

Anyway, penetrating oil could get underneath it - granite is porous.

Granite is of course not porous.


You are as always, wrong. Not very porous but certainly slightly
permeable. Not 'like glass' as you say. No.

TW