I'm not entirely sure how the old (1949) aluminum window has held up in the shower for all these years, but I'd like to replace it, probably with vented glass block. Now here's my question. The wood windowsill extends about 1.5 inches past the wall and 3 inches from each side of the window. When the bath was re-tiled (probably 10 years ago), they cut the tile and fit it around the sill. The sill is quite useful for shampoo bottles, etc, but it looks like keeping this thing waterproofed is an uphill fight. There's probably a few dozen coats of paint on it. My questions are: 1) Can I keep the sill from rotting out by frequent cleaning, painting, and caulking? 2) If I start removing tile to get the sill out, should I expect to end up re-tiling the entire shower?

thanks for your help on my previous question. Now I have another. we got the tub out easily enough but the pipe that has the drain and overflo came out. Don't think it was connected properly to begin with because the whole outside corner of the tub was rusted out. That is why we were replacing the tub. The pipe doesn't seem to be broken anywhere but seems like they tried to seal the joints with tar. Is this an acceptable way to seal joints in Florida? What is the correct way for us to reseal it to put it back in. We are on concrete and this pipe slides inside the one in the floor. Thanks for your help.