The shower floor is sloped from the walls to the drain, so I do not believe you will find a "solid" floor. I will offer an alternative that worked for us. There is a product called Grout Shield, it looks like paint but acts like a grout sealant. They sell a kit for $60 that in enough to do an entire house, I know I did our stretched gardenia! If the shower is like ours (2 inch square tiles) this is a real pain but it can be done. Also, since this product is like paint, you can change the color of your grout.
I have more info, but i am tired of typing, so if you are interested in this approach send me a Private message with your phone number and we can talk.
DO NOT use a clear sealer with the name 411 or 511 it does NOT work!
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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