Lobster wrote:
I've got an old brick shed with a concrete slab roof; watertight at
the
mo, but in one corner (external) the surface of the concrete has
broken
up under the influence of weather; probably an inch deep? in a 4-5
inch
slab.
3:1 is the strongest non-shrinking mix, and just a little pva makes it
adhere better.
NT
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