kelleyk
08-14-2007, 05:11 PM
Hi All,
In 3 days (8/17) I'll begin grout haze removal on an exterior vertical mosaic wall mural in the Oakland, CA area. The mosaic is comprised of glazed ceramic tile and mirror. The light haze is from cementitious (Custom Building Products) grout applied one year ago. The final buffing of the tiles after grouting didn't happen.
Because of the age of the haze I had assumed I'd need to use a 1:10 mix of muriatic acid and water to remove the haze, but after sifting through many postings on this site discouraging the use of M Acid at all due to its health risks I'm having doubts.
Should I assume that only M acid will work on year-old haze, or should I start with vinegar/water, then move up to sulfamic, then use M acid only as a last resort? Is there an equally powerful - but not as toxic - substitute for M acid?
Grateful for any advice you can provide,
Kelley K. in Seattle
In 3 days (8/17) I'll begin grout haze removal on an exterior vertical mosaic wall mural in the Oakland, CA area. The mosaic is comprised of glazed ceramic tile and mirror. The light haze is from cementitious (Custom Building Products) grout applied one year ago. The final buffing of the tiles after grouting didn't happen.
Because of the age of the haze I had assumed I'd need to use a 1:10 mix of muriatic acid and water to remove the haze, but after sifting through many postings on this site discouraging the use of M Acid at all due to its health risks I'm having doubts.
Should I assume that only M acid will work on year-old haze, or should I start with vinegar/water, then move up to sulfamic, then use M acid only as a last resort? Is there an equally powerful - but not as toxic - substitute for M acid?
Grateful for any advice you can provide,
Kelley K. in Seattle