songbird wrote:
....
is there something i can add to the mix
that will help it stick? or should i use
something else?

....

they didn't have Titebond III but another
bonding agent. so i chipped out the whole
sill this morning and then redid it with
fresh mortar with the acrylic bonding agent
added to it (about 2/3 bonding agent and
1/3 water) also used the bonding agent as
described on the container to coat the surface
before i put the mortar down (everything was
kept damp as described).

some of the previous rounds were sticking
pretty well, but not in the area where it
comes up (gets the most traffic). it is amazing
what you can do with a hammer and a chisel.
scraped the whole area clean down to previous
concrete slab and then i made sure the area was
roughed up by grinding it a bit with a coarse
stone. the stone really didn't seem to do much
but i figured it was better than nothing.
swept off the dust, rinsed it off and then put
down the new mix.

finished up just in time for a rain storm
so damp cure is not a problem. after it passed
and the sun is out i've put towels over the area
and hosed 'em down. i'll do that every few hours
until i go to sleep tonight.

my previous efforts were all done in the fall
when the temperatures weren't the best too, so
i'm sure that didn't help.


songbird