There are some alternatives to what you are planning. You can have the existing grout removed and replaced with the newer (epoxy?) grout that is waterproof. A less expensive option would be to use a colored sealer (I did this myself), cost was under $50, and took a few hours of work, that was at least 5 years ago, and shower is still in very good shape. I have seen a MAPIE product at Lowe's, this is not the one I used but MAPIE is a well known quality product.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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