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Alternative to hydrofluoric acid for bath resurfacing

I have a bath resurfacing business and would like to no if there is any other way of etching porcelain other than hydrofluoric acid.

thanks,

Grant Warner
bathware resurfacing - Rotorua, New Zealand
2007

Sand blasting with aluminum oxide or silicon carbide grit size around 120 or finer will eat away porcelain surface. Don't know if it's suitable for your purpose.

Guillermo Marrufo
Monterrey, NL, Mexico
2007

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