Do you know if your garage floor as a vapour ######er under it? I would guess that it does not. The point is, you have to use a product that is water vapour permeable. If you use a product such as an epoxy or other coating that is non-permeable, the moisture from the slab and from the ground below, will eventually cause the coating to delaminate.
Your best bet would be a concrete sealer. For a garage application, I would use one of the following:
Hydrozo 100 as manufactured by BASF.
Sealmaster 100% as manufactured by Technical Barrier Systems Inc.
Dry-Trete 1000L as manufactured by DRE Industries.
Protectosil 300 as manufactured by Evonik.
SW-244-100VOC as manufactured by Sherwin Williams.
SIL-ACT ATS 100 as manufactured by Advanced Chemical Technologies.
Sikagard SN-100 as manufactured by Sika Canada Inc.
I specify these sealers for locations such as fire hall apparatus bays (where they park the fire trucks). I have also specified it for locations such as the lowest level of parkade floors (where the the slabs are on grade). They are all Alberta Transportation recommended Sealers.
If you want to go a bit cheaper, then you could look at a product such as one of the following:
Ashford Formula as manufactured by Curecrete Chemical Company Inc. and distributed by Duracon Consulting Inc.
Liqui-Hard as manufactured by W.R. Meadows.
Seal Hard as manufactured by L&M Construction Chemicals Inc.
Shur-Seal as manufactured by Paul M. Wolff Co and distributed by Star Industrial Floors.
These sealers densify the concrete and provide a good surface. If you are doing a lot of oil changes, then you should go with one of the products in the first list.
Note - all of these are clear sealers, so you will still have a grey concrete appearance to your slab.
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