When my dad first started laying flagstone, he never used any sealers. About 30 years ago he did and he noticed that the stone that was sealed looked better and the joints were stronger.
You paid a lot of money to lay your flagstone, so spending $100 for a good sealer is a good investment.
You can call Prosoco at 1-800-255-4255 to find out the best sealer for your situation. My dad has been using their products for years.
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