Best grout sealers for tile floors?

[mikeinflorida]

I've used Miracle 511 impregnator. After talking with their tech support, they recommended that over their actual 'grout sealing' product for sealing grout on tile floors.

I used a wheel applicator. The tile floor was porcelain. A little would get on the tile, so we had to carry a dry rag and wipe excess as we went.
I then saw another 'tile sealing' company using a solvent based spray can product called 'Tile Guard.' It had quite a strong odor. They basically sprayed all the grout lines on the tile two coats on common areas. The excess that gets on the tile itself simply evaporates and disappears for the most part. If any excess can be seen, they say to simply wipe off with rag dampended with warm water.

My question(s) is, which product for professional purposes is the most effective in resisting all kinds of stains and is long lasting for sealing grout on tile floors? The Miracle 511 inpregnator is an invisible sealer designed for sealing tile floors. So for sealing grout, does it make more sense just to seal the entire floor as opposed to just sealing the grout? And...
what application method is the fastest and neatest to seal grout? Would it be the wheel applicator?
Thanks in advance for your help.

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[Davestone]

Don't be confused about sealers,impregnators are fine for grout,some have more solids than others,and some leave less residue.This leads me to wonder how well a sealer can work that disappears from tile but stays on grout and does it's job.I've never used it but someone would have to explain to me the concept.Wheel applicators are fine but they tend to be inacurate as to the amount dispensed, so sometimes you need to wipe the joints off lest the sealer dries and turns them whitish.Best sealer? Don't know myself but the Miracle line is pretty good, i use it,so are most other popular brands.