Resurfacing a lot of old concrete and am pleased with the results. I have come across a driveway and sidewalk that has been stained and sealed. The work was done years ago and it appears the sealer has worn off considerably. It appears to have some acid residue from lack of cleaning before sealer application. There is a small amount of beading when wet. Not much. On to my question. What is the best approach to getting this concrete ready for resurfacing options. Should i grind? It is approx. 2000sf



