Put slate on my outdoor front porch, question about sealing

So I'm remodeling my entire house from the bones up. In the final stages and I ended up getting a hell of a deal on some slate. I decided to put it on the outdoor porch (Yes I know slate is not ideal for outdoors). The porch was not square as it is over 50 years old so some of the grout lines are bigger than 1/2 inch. Most vary from 1/2 - 3/4 inch. What is the best type of sealer to use? I really like the "wet look" and Home Depot sells a wet look sealer for a very good price - [wet look](http://www.homedepot.com/h_d1/N-5yc1v/R-202263927/h_d2/ProductDisplay?catalogId=10053&langId=-1&keyword=wet+look&storeId=10051) I like how it gives it a glossy wet finish and it looks like it's a complete seal over the top of the slate. Is this a good sealer to use or should I hit it with something like this before - [511 sealer](http://www.homedepot.com/Flooring/h_d1/N-25ecodZ5yc1vZaq7r/R-100076375/h_d2/ProductDisplay?catalogId=10053&langId=-1&keyword=sealer&storeId=10051) or go with something else all together. I live in northern Idaho and our winters aren't terrible so I'm not super worried about the elements.