Ok, so I've been remodeling the bathroom at the house. We picked out the tile and we laid it down last Saturday. I asked my wife when we were at Lowe's to get the color grout she wanted. When I went to mix it up I put in the water and got a good consistency before applying it. After about 30 minutes the shit started locking down on me. To the point where I couldn't get it out of the bucket. I went and grabbed the bag and found out she bought rapid set mix 
Shame on me for not looking and just going with it. Anyway, I salvaged the job with some scrapers and sponge work and believe it or not it came out pretty good. So to the problem/issue... because of the cuts I ended up with a pretty fat grout line near the tub. I figured I could run a piece of molding along the bottom and take up some of the line and make it look good. The problem is that the grout is humped up and set. I was focused on the floor and got it right but forgot to address the tub base. So here's the dilemma. I need to flatten this area out so the molding will fit.
So as the internet so eloquently puts it, "wat do?" I tried sanding it down with some 80 grit and that didn't happen. How can I flatten the area without fubarring the rest of the tile and tub? As you can see, the grout line at the tub is fat.
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