Do you have to seal concrete planters?
I have made a few planters using mortar mix and had some problems with the planters producing dust/chalk once the soil and plants are in. I have read that this could be due to a number of factors such as temperature at cure time and the amount of water used in the mix. Will using a sealer address this after the fact? Will I need to clean the concrete with anything special before applying the sealer? Thanks!