cleaning and painting concrete

[bananaspark]

I've posted elsewhere about a heavily oiled garage floor that now decided needs painting with garage floor paint, question is exactly how much scrubbing with detergent and wd40 is required.
Is it sufficient that the area does not feel oily to the touch?, or does every trace of stain have to go so that the paint dont start peeling off?

b.

 

[Robbie uk]

Use GUNK and rinse with clean water after and dry with lots of old cloths.

 

[JohnD]

there are two sorts of Gunk, I recommend the one that is like a super-strong washing-up liquid. If you look at the container you will see it says it can be mixed with water.

the other (original) one says it must be used on dirty engines that have NOT got any water on them as water stops it getting at the grease.

they can both be washed off with water.

 

[billyo]

use water base or solvent free epoxy on floor it will stop paint peeling , just make sure floor is dry and grease free