I'm looking for advice regarding acid etching ceramic and porcelain tiles to create an anti-slip surface.
I've previously used the following product, where the Active Ingredient is Sulphonic Acid < 7.5%
While the product definitely does work to a very slight extent, it doesn't etch and roughen the surface of the tiles anywhere near enough. I am trying to find out which specific acid (and what approximate concentration) is the most effective at moderately-aggressively etching ceramic and porcelain tiles. While there are numerous acids available that I can use (e.g. Hydrochloric, Phosphoric, Sulfuric), I just don't know which one would be the most effective for this purpose. While I always wear protective gloves and glasses, I am not touching Hydrofluoric Acid - forget it. Ultimately, I want the tiles to feel as close as possible to commercially available non-slip tiles (i.e. like ultra fine sandpaper texture).
I have already phoned and visited numerous tiling outlets and hardware stores, and the assistance I've been given is beyond useless. I've also done lots of Internet searching but still haven't come up with any clear advice. I'm hoping someone with knowledge here can offer some advice.
Thanks all.