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Brush-on product to seal concrete sills
- Thread starter Possom
- Start date
Thompson's or any silicone waterproofer will do, but may need recoating after 5 years or so.
If you look for a silane product which is similar, it will last upwards of 25 years. These will typically cost 4x as much.
If you look for a silane product which is similar, it will last upwards of 25 years. These will typically cost 4x as much.
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