When purchasing a silane siloxane concrete sealer there are a few things to consider:

1. You can purchase a water or solvent based. The ONLY reason solvent based tend to be more popular is because they are formulated with a higher solids. The highest solids solution you will see with water based is 20% but most water based solutions are 2-10% solids.
2. You can purchase a sealer by the % solids solutions. 10% solids is ideal for water based and 40% ideal for solvent based.
3. Look into the testing data. Some products have gone through very rigorous testing and been approved for certain applications. Look at ASTM testing data, or certifications such as a DOT approval.
4. Look into the warranty. Usually, if a company offers a ridiculous warranty on a silane siloxane they are a fly by night company and won’t be around long enough to back the warranty up. The typical life of a silane siloxane is anywhere from 3-8 years. You could get less and you could get longer but that will depend on the substrate, the material, and how much you apply. Water can stop beading after a few years, but the material will continue to work below the surface. 10 Years? 25 Years? Don’t be fooled by false warranty claims.
5. Buy the right amount of material. Ask a technician what would be appropriate. If you are applying a silane siloxane to brick you will need more material than if you were applying it to trowel finished concrete. Applying the correct amount of material will give you the longest life, and the most protection.