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f37t2 t1_izszxqu wrote

Reply to comment by SolidPoint in Used drywall compound instead of tile adhesive. How screwed am I ? by xdr567

I agree that the tile needs to be redone, but drywall compound is an adhesive. It adheres paper tape to drywall. The difference between the green and blue lid drywall compound is the amount of adhesives in it.

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MeshColour t1_izt16rg wrote

It's adhesive to paper... Why not use Emlers white glue adhesive, that's how strong your best drywall compound is going to be, and it will work on tile just as well (aka it won't work at all)

Just because something is an adhesive, doesn't mean it can work as an adhesive on any surface

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Clark_Dent t1_iztsftv wrote

By that logic, pudding is an adhesive. Paper drywall tape will adhere to anything wet.

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Mr_Festus t1_izuveqj wrote

Try using water and report back to us

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Clark_Dent t1_izv0v01 wrote

You can stick a piece of paper to almost any surface with just water, yes. There's nothing more adhesive about drywall mud than dirt mud. That's part of why it's such a pain to work with.

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HawkspurReturns t1_izwbia8 wrote

Paper sticks to paper with water. Plasterboard has a paper face. Paper to paper sticks with hydrogen bonding. It is exactly how paper holds together - until it gets wet.

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captain-snackbar t1_izuvl0k wrote

No, not exactly. Paper tape is embedded in the compound — first you run a knife’s width of mud on the joint, then embed the tape, swipe with firm pressure to get excess mud out, then you mud over top of the tape. Altogether, the tape becomes encased in the mud not unlike rebar in concrete — serving a similar function, it prevents cracks from forming in dry mud.

If you just leave tape on top of the mud, once everything dries, you can peel the tape off without much resistance.

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