No issues with the MaxJax after I guess 5 years and lots of lifts. Used on many different cars from '67. Mini to A6 wagon. Never an issue with the concrete or fear it having an issue. We just moved and I installed it into a floor that is didn't know. As a precaution I used anchor expoy on the anchors. You will need 1 tube to do a good job. Follow directions and you are golden.
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Jon
1966 912, 1976 911
1986 944, 2000 Boxster
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