Yes. In fact, at St.
Clair Monument & Granite Works we seal it twice. We seal it once
before the slab is cut and again after the counters are installed.
3.
Is sealing granite a job for a
professional or can I do it myself?
No. Acidic products
will not affect granite. They will, however, do serious damage
to marble. The acidic pH reacts with marble and will actually
etch the surface.