Sammy' wrote:

Is there anything that can be done to clay pots to seal them up. Either
something to spray on the whole thing or just to coat the inside. I like the
look of clay pots but after time minerals and crud start to leach through
the pot. I do clean them off from time to time. Has anyone every done this
before and what have you used.

I would not seal them. I use clay pots specifically because they
are porous.

Moisture evaporating through the sides (even when they don't look
damp) keeps the soil in the pot cool even in full sun. It's that
evaporation process that causes the mineral build-up on the
outside of the pot.

There is also some air penetration into the pot through the porous
sides, which is very important for confined roots.

--
David E. Ross
Climate: California Mediterranean
Sunset Zone: 19 -- interior Santa Monica Mountains with some ocean
influence (USDA 10a)
Gardening pages at http://www.rossde.com/garden/