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I plan on re-painting a bathroom this weekend but I'm not sure how to proceed with filling in the gap and sealing the area between where the shower insert meets the drywall. I appreciate any advice. Here is a picture of what I am referring to. https://imgur.com/a/CrnKpPa
Edit: I appreciate the responses. Thank you all.
So I've got about a 1cm gap between the top of my shower and the wall. What am I supposed to seal this up with? Caulk? Sheetrock mud? Spackle? Do I have to tape it up first with something? I have no idea what to do about this, please help!
I read somewhere to "fill the gap between the rock edge and shower shoulder with durabond and flat tape with straitflex," but I don't know what durabond, flat tape or straitflex is :0p
I would not use acetone because a spill (which is very likely) could (would?) damage the fiberglass shower pan. If you feel it necessary to use a solvent, use rubbing alcohol, and be sparing with that.
I doubt a solvent is necessary at all. Note that the shower pans have a lip behind the tile so water is almost certainly NOT leaking into the wall. So there is no urgency. It would be unwise to recklessly do the wrong thing in an uninformed attempt to caulk this joint. DON'T think, "I have to do something now, the problem will only get worse and worse the longer it goes on."
There are two schools of thought: One is to attempt to maintain a waterproof 'seal' by ensuring all grout is treated with a waterproofing agent (but that agent is likely to break down and need to be reapplied after 5 years). The other is to assume that any waterproofing will eventually fail, and that one should try to channel any moisture back into the tub.
In either case, the base of the tub can be grouted as shown in you picture, but the grout won't stick to the fiberglass and when you step in and and seal it provides will be broken. Thus if you want a true seal you should use a flexible silicone caulking.
However, moisture can be absorbed by unsealed grout and into the cement backer board, and when you take a hot shower, the temperature differential can cause condensate to form on the back of your tiles. The lip in your picture is called a "weep hole" and is intended to allow that condensate to flow out from behind the tiles and thus is not intended to be covered with caulking or mortar.
The effectiveness of weep hole is contested because if your tiles aren't troweled vertically, the condensate won't be able to flow down to it. Moreover, your specific setup is questionable as you likely are better off having small weep holes every 12-18 inches than just 2 large ones on either side of the tub.
Thus, my suggestion would be:
Carefully clean out loose grout using a grout saw (try not to scratch the tub).
If you are sure that your tile was installed using vertical troweling, then re-grout the tub everywhere but where your weep holes are (and possible leave an extra spot in the center of the wall), then seal all grout with a grout sealer.
If you aren't sure you have vertical troweling, then don't bother rerouting the base of your wall, but re-seal the grout in the rest of your wall with a grout sealer, then use a silicone caulk around the entire base of your shower. Remove and replace this caulking about once a year.
See this answer for more detail about tile tub interfaces: https://diy.stackexchange.com/a/67538/18575