Thank you to all who responded on and off list with suggestions
on how to seal my concrete birdbath. Since a few others have
expressed interest, I thought I'd let everyone know that I'm
convinced by Bill Ellis's discussion (in a post on MD-Osprey),
and have decided to try using a sodium silicate solution.
That seems like the safest bet for the birds, since I'll know
exactly what I'm dealing with chemically, it (hopefully) shouldn't
be that hard to apply, and it's not too expensive for the small
amount I need. If all goes well, it'll arrive in time to do the job
this weekend.
Jason Waanders
NW DC
jwaandersATstarpower.net
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