I'd do a quick check for moisture. Duct tape a one foot square of plastic, preferably clear, to the floor. Look at it the next day and see if there is condensation on it. If there is you will have a hard time getting any coating to adhere to it. If not and the floor is saturated with oil you might have to have some one shotblast it this will remove some concrete from the surface and give the coating something to grab. The other choice is do some snaptogether tiles that they make for garages, easier on the legs also. Hopefully the floor will be covered with sawdust anyways.
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