You need to pressure wash it at 3500 PSI and then use thoroseal (available
at Home Depot).

You need to pressure wash with a high PSI to make a rough surface for the
new cement to bond to. Since you are bonding new cement to old cement there
will be no chemical bond, only physical.

Cement/concrete is porous to 4-5 inches. Having a skim coat of mason mix,
etc won't help you. Thoroseal is an admix of cement and acrylic. This makes
it waterproof at 1/4".

Sam



"lab~rat :-)" wrote in message
...
My concrete pond has developed cracks from a tree that has been
eradicated about 8 months ago. I want to seal the cracks, but the
whole task seems overwhelming.

Check out the mess:

http://blueaxe.home.mindspring.com/pond.html

In the second photo you can see the biggest crack that has been
cleaned and cleared of root material (by my dog's head). The water
level sinks to this crack.

The third shot is a closeup of the crack to well above the waterline
(where the big hole is)

4th is a closeup shot of some small cracks that have developed above
the huge crack. you can see the small roots growing through like
thick hairs.

Fifth through last is the attached waterfall where stucco has spalled
off of the forming foam.

First, is there a sealing material that could fix the major crack?

How should I handle the small cracks with organic growth?

I assume the whole waterfall should be fixed prior to trying to
re-establish the pond. How would you recommend fixing the spalling
stucco, and what is it sealed with once it is fixed?

TIA
--
lab~rat :-)
Do you want polite or do you want sincere?