No compression at all seems to indicate a valve is stuck open. Try turning the engine over slowly by hand with the plugs out and the rocker cover off and check all the valves are going up and down. Check the clearance of the valves on No.1 cylinder. If there is no clearance then the valve will leak and you will get no compression.
The mayo could be caused by condensation - but if you are putting everything back together after you have cured the lack of compression then do an oil change and keep an eye on water/oil levels when you finally get the engine running.
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