Instead of redoing all the grout in my bathroom, I just put silicone over it until I am ready to take it all out and make it prettier. 100% solved the problem going on over 6 months now and it's looking foine*, I check for any places it stops making contact over week or two to be safe in case I need to scrap away what I can and reapply because nothing lasts forever. Edit:typo

Mine is a fiberglass three-piece shower surround and the crack is basically in the middle of the back panel. It’s SO thin but there’s a clear separation where water could get in, so I just want to keep it out. I have touch-up paint specifically for the tub, but I don’t think that would fill the crack. I was thinking either silicone, or maybe even a thin layer of epoxy followed by the touch-up paint.

I wouldn’t use silicone as it isn’t too durable when exposed to scrubbing, rubbing, etc.

I would use something like OSI Quad in white and just cover the crack plus 1/2” all around and keep it like the thickness of a quarter.

I had a small cluster of hairline cracks and ended up using a piece of clear contact film/liner that was advertised for kitchen surfaces to put over it. Someday I'll replace the surround...but this has held up just fine since I put it on 4 months ago. Yes it's a rectangle patch that's obvious to the eye, but it's clean looking and not an eyesore imo, no air bubbles behind it. I can share more info and a pic if interested!

I forgot I had a pack of Devcon epoxy bathtub repair, so I’m gonna try my luck with that. I already sanded a little bit past the track, so I should just need to spread the epoxy, lay the fiberglass cloth over that, and then spread more epoxy over that.

EDIT: I just finished and it looks awful. I'll maybe try tidying it up around the edges with some smooth grit sandpaper when it's dry, but we're probably moving within the next five years or so, so worst case scenario, I knocked a couple grand off the asking price of my house, haha.

flex tape as a temp solution.

I know this is posted under DIY, but we've had a fiberglass repairman fix some cracks for us and they're perfect. Can't even tell a repair was made in that spot. It's a fairly quick fix, so I doubt it'd be excessively expensive.

100% silicon caulk.

Don’t knock the price of the house give a repair allowance at closing.

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I ended up using Devcon epoxy/fiberglass repair and it came out awful! Gonna try wet sanding around the sides when it dries.

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They make superglue in thin viscosity that will penetrate cracks (frequently used in woodworking). You might be able to use that, clean off the excess, then spray the hardener. For any approach the concern is impurities in the crack like soap scum and oils.

Buy one of those wire shower caddies that get attached with two strong adhesive stickers and place one of the sticker right over the inch crack. Clear silicone around the sticker for extra protection. Place and install shower caddy.

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I was kidding, haha. It looks terrible right now but it's just aesthetic -- I'd rather have it ugly and keep water out than have a barely visible crack that lets water in. There's a hole in the laminate floor in the basement from when I dropped a 500 lbs. barbell doing squats, so there are several things in my home that buyers may question but I'm not going to advertise them. We can deal with that stuff if they ask about it.

Oct

Yes, I agree that’s what I meant. I wouldn’t say anything until it comes up in the inspection.