I want to know if I can reapply a solvent based impregnator or sealer without removing the 511?

You’d need to read the application directions for the product that you’re considering.

I also want to know where to buy the above SST products?

From what I can see online, the product was called “SB-Sealer”, from a company called “Surface Treatment Technologies”. The website shown here is a dead link, so it might be the same for the company.

Is there truly a 5 year, or 10 year, or lifetime granite sealing/impregnating product or will I have to repeat the treatment every 6 to 12 months?

There is a lot of conflicting advice about this online. This page seems to take a reasonable approach, explaining that whether sealing is required and how often that needs to be done depends on the granite itself. It also cautions against the downside of applying sealer when it's not required. We’ve never resealed the granite countertops in our houses (20 years and 6 years), but we chose really impermeable stone in both cases. In neither house was there any indication of staining, but we’re also the type of people who clean up spilled liquids.

 

Thank you for your kind reply. My granite counter top discolors when water is applied. Yes, the website link is dead. Guess I need to look for a good sealer.

 

The last few granite supply companies I've dealt with had their own brands of cleaners and sealers that they sold in their offices. Price was reasonable so rather than hunt all over for something we thought would work, we just went with their recommendation.