I never used the one from Mapei but is that one that needs to stay on for 30 minutes to 2 hours?

On Mar 8, 2014 2:12 PM, "Stephen Webb" <stephen@newlifemarblerestoration.com> wrote:

Customer has severe epoxy (mapei) grout residue in limestone pores. have tried the grout manufacturers epoxy grout haze remover and K&E coating remover with no effect. Before we grind is there anything else we should try?
Thanks
Stephen

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