This compression system is a very handy invention, especially for Web users, because it lets you reduce the overall number of bits and bytes in a file so it can be transmitted faster over slower Internet connections, or take up less space on a disk.
Concrete hardens to 600PSI (Minimum) after 24 hours. This means that 5 three grown men could all stand on a pogo stick (if that were possible) who's base covers 1 square inch without harming the concrete. You walking with shoes on exert about 10 PSI, well below anything that could damage the new pour.
Oil based polyurethane takes longer to dry than water based poly. 1  24 hrs before you can walk on the floors. 2  Hours 24-48, you can walk on the floors with socks. 3  Avoid shoes and bare feet. 4  And, make sure your pets (who usually have bare feet) do not walk on the floors during this time. 5  48 hrs you can walk on it with shoes.