This sealer is certainly easy to use. The slate I was sealing is only 24" X 82" being used as an interior sideboard top. It is a cut down slate from an old pool table. It doesn't take much sealer to do the job and I removed all the excess after a short time. We haven't used the surface yet but expect it to be fine. It was simple to work with and the directions were clear.
My overall experience has been excellent so far. The customer service was great in helping me order the correct product and the product arrived only days after! I've already sealed my newly installed travertine tiles and I like the fact that this product does not really darken them or leave a noticeable film. Rain water beads up on the patio now, however, it is not slippery. I cannot comment on the longevity since that remains to be seen down the road, hopefully sometime from now. If it lasts a reasonable amount of time, I'll just apply another coat when the time comes.
After removing the mold from my flagstone patio I wanted to keep it clean for a long time. Product was easy to apply and leaves no shine- which is what it claimed.
Thanks for the great feedback!