SOMEONE put up a post a while ago saying they added acrylic paint and sped up the cure phenomenally
but in addition to cure time, in a plant pot you need to consider alkalinity- maybe a plastic liner would solve that
tho i can't say from eexperience- the recommendation i keep finding is
'leave it out in the rain for a year'. i put some pix of the plant pots i made on a post to this site.
P'crete makes great plantpots.
cheers, eo
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