Hey gang, wanted some opinions or info on the best product or products available to seal tile grout. I've got three rooms that I'd like to re-seal, two of them were previously sealed with an aerosol type spray that you sprayed directly onto the grout lines. This initially worked but then wore off quick, I am looking for something a bit better that will last longer as with that product I felt I had to re-seal at best every 6 months. My plan is to clean up existing grout lines and then re-seal with a higher end product. Any recommendations on product or tips/tricks on how to apply would be greatly appreciated. I thank you advance for your time and help!