Enrich N Seal is a penetrating sealer and will enhance & seal and thus give the slate a wet look. There are a few other choices that may suit the purpose from the Aqua Mix Range and be easier on the pocket however in the main they are topical sealers. The first alternative would be Seal & Finish Low Sheen which can be applied in coats and the more coats you apply the better the sheen the difference is it is a topical sealer and will eventually require some maintenance depending on the foot traffic.
Floor Shine & Hardener on the other hand is a low to medium gloss - more of a satin sheen really. More coats will increase the gloss slightly but it will never get too shiny.
It is also a topical coating sealer and as such will slightly enhance the colour of the stone, not darken it, but bring out some of the colours a little - in that resepect it could be described as a wet look (as opposed to looking dark due to being saturate with water. It will darken the stone initally (just as water does) but this will dry out to near the original shade, but with added highlights.
Seal & Finish is also more durable than High Gloss. However, as it is a coating sealer and not an impregnator, it is going to wear - all coatings do as they are in direct contact with the traffic, the sealer takes the wear before the stone. So, over time the sheen will appear to diminish, it is hard to give an exact time on how long it will last as this depends on so many things (amount and type of foot traffic, how often the floor is washed and what with), but it could be anything from 6 months in extreme situations up to 3 years. As the sealer dulls, you can top it up with an additional coat, without the need to strip it back first - just make sure the floor is clean and dry.
hope this helps and gives you few more options
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or LTP colour enchancer..
