Condensation issue

68gtxman said

It’s most likely condensation. When the surface temperature is lower than the dew point, water vapor in the air will condense on the surface. Therefore this will happen on high humidity days when the slab temperature is cooler than the dew point. This is tough to fix without lowering the humidity in the space or raising the temperature of the slab or air. Moving air over the slab will help by causing the condensation to evaporate.

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This is most likely your issue RRR. I opened the garage door garage a few weeks ago after a cold snap to let some warm air in but it was humid. Instant condensation on everything.... including all over a new crank being fitted in a block. Heating the space or the slab is what is needed. Sealing won't change this particular matter and if you seal a slab that does not have an adequate vapor barrier under it, you are just locking moisture in the slab.

If moisture is coming up through the slab, you may also have poorer drainage on one side that may cause that side have more moisture under it than the other. Hard to fix if you are on flat ground; one more reason I don't live in the flat midwest anymore; it's hard to get good drainage in the flatlands there, and a lot of effort needs to be paid out there to prevent these issues.