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Unread 02-11-2020, 08:50 PM   #1
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Terrazzo Shower Base Restoration

Hi, Folks.

I have a 1968 vintage terrazzo shower base that needs some work, about 54" x 36".

It doesn't leak, and is not stained, but it looks and feels rough. As far as I know, it was never sealed or refinished since the original installation.

It feels like it might be rougher than would be covered by a thick coat of sealer, and there are parts where the grout (portland cement based?) seemed to have crumbled a tiny bit, in places.

The cove of the base and the curb are fairly smooth, but do not look very polished.

I have some experience in surface repairs and refinishing of furniture and boats, but not much with stone.

The shower base isn't craggy, but it is hard to keep such a rough surface clean.

I'm guessing that I could use a wet variable speed polisher with diamond impregnated pads to smooth things out, and then apply some type of sealant.

Or maybe just a thicker sealant, but there are a few places where things look a little more pitted/crumbly.

If it is too much cost/trouble to rectify, I reckon I'll just replace it. But I rather like the look of it.

I've looked through other threads on the forum, but didn't see much about DIY refinishing, or many current posts about sealant choices (mostly urethane?)

I've attached a picture of the surface in question.

Thanks in advance for any help!
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Unread 02-11-2020, 11:03 PM   #2
Tool Guy - Kg
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Howdy, Mac! I think you take the prize for longest stretch after joining before posting!

Terrazzo gets its shine from being polished very smooth, not from sealers. At more than 50 years old, it’s past it’s expected lifespan. But if you wanna give it a go with those pads, give it a whirl.

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Unread 02-12-2020, 11:52 AM   #3
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Thanks, sir.

Yes, I've lurked here for quite awhile, without anything much to contribute. But I have learned a few things, thanks to everyone who has shared problems and solutions.

I went and read the post in the liberry about sealants, so I reckon I'll just try some polishing and see what transpires.

Thanks again for the reply!
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Unread 02-12-2020, 10:40 PM   #4
Tool Guy - Kg
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Sometimes you don’t know what grit to start with. Ideally. You’ll start out with the highest grit that will flatten the partially eroded surface. Then run upwards through whatever grit makes you happy with the level of sheen.

I’d error on starting a little too high. If the polish starts looking lumpy, you need to start again with a somewhat rougher grit.

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