Howe much postage to send a postcard from US to Canada? As of September 2014, it costs $1.15 to ship a post card  internationally. If it exceeds 4 3/4 inches high or 9 1/4 inches  long, you will be charged the First Class Mail In â¦ ternational price. + 3 others found this useful.
Concrete is never truly done curing, but the minimum wait time should be 28 days. A slab typically cures at least 80% during that time. I suspect the manufacturer is asking you to proceed cautiously to avoid a lawsuit. If you (or your client) can wait that long, then wait the 120 (or more) days. But I wouldn't put any flooring on it inside a month.
By Concrete Construction Staff. Q: We placed a concrete slab for an exterior multipurpose game court. How long do we have to wait before painting basketball-court lines? A: Because many different paint types are available for concrete surfaces, you should follow the instructions provided by the paint manufacturer. Most literature recommends a 28-day cure, but it's not clear whether that means a 28-day drying period after the concrete has been moist cured, or a 28-day wait after the concrete has been placed. The Portland Cement Association (Ref. 1) recommends waiting 28 days to 6 months, depending on surface conditions and the coatings used on the surface.