trevatine sealant

Hi All,  I have been laying "roman" trevatine tiles on high and medium traffic volume floors and, after filling, tried 2 sealers. Stonemasons Choice @ AUD $ 285 for 3 litres and found result not satisfactory for sealing as liquids with PH reading out of balance still penetrated. Second sealant used "Coohey" a New Zealand product made in Maroochydore Australia for AUD $ 65 for 3 litres and found this such a good sealer that I used this product  on the next floor only and find it excellent. At first the application appears shiny (what I dont want) and after 2 weeks this shine changes into the desired matt finish. That is now all 1 year ago and the floor still performs well. I recommend this Coohey Product for trevatine highly, particular also for its pricing. Cheers Erich