Index
What a bathroom wall actually is
A shower wall is not one thing. It is a glazed face interrupted by porous joints, or a molded shell that flexes, or paint over paper, and a pad that holds beautifully on the first will not hold at all on the third.
5 surfaces below, in one table. Every value in a row belongs to that row: the drilling column says something different for glass than it does for drywall, and neither borrows from the other.
| Surface | What adhesive does here | What comes off with it | Drilling |
|---|---|---|---|
| Painted drywall | Holds well on sound, fully cured paint and badly on anything chalky, glossy or recently applied. | Paint, and under the paint the paper face of the board. This is the surface where removal does real damage. | Needs a fastener chosen for hollow board or for framing behind it. Patchable, but never a guess in a wet wall. |
| Ceramic tile and grout | Excellent on the glazed face of a single tile. Poor across a grout line, because the pad only touches the tiles at its edges. | Usually just residue on the glaze, which is the best outcome available. Grout can lose its surface where a pad was pressed into it. | Effectively permanent. A hole in a glazed tile stays a hole in that tile, and matching a discontinued tile is not realistic. |
| Glass shower door | Excellent bond on clean, dry glass, undermined by two things glass alone has: constant movement and a hard water film. | Residue only, in almost every case. Glass is the one surface here that reliably survives removal. | Never. Tempered glass shatters completely when penetrated, and a shower door is tempered by law. |
| Fiberglass and acrylic surround | Holds on the flat panels, poorly on the molded curves and the textured floor, and every bond is loaded by panel flex. | The gloss finish can dull or mark in the shape of the pad. Not a glaze, so it does not survive removal the way tile does. | A hole through a waterproof shell, into a cavity you cannot see. This is a plumbing decision, not a shelf decision. |
| Textured paint and wallpaper | It does not work. Texture leaves the pad touching only the high points, and wallpaper hands you a surface that peels by design. | A strip of wallpaper, or a plug of texture compound. Whatever the pad is stuck to comes with it, because that layer is the weak link. | Mechanically the same as the wall underneath. Cosmetically worse, because patched texture and matched wallpaper rarely disappear. |
One line on each of them
- Painted drywall
- Paper, gypsum and a film of paint. The bond is only as good as the paint underneath.
- Ceramic tile and grout
- A hard glazed face interrupted every few inches by a recessed, porous line.
- Glass shower door
- A perfect adhesive surface that moves every time somebody opens it.
- Fiberglass and acrylic surround
- A molded shell with a coated gloss face that bends when you lean on it.
- Textured paint and wallpaper
- The surface adhesive manufacturers exclude on the box, and the reason they do.