I'm in the process of doing mine with Ronseal this week, garage size is 20ft x 24ft.
Prepped the bare concrete with Ronseal concrete sealer, which used the entire 5 litre tin. (£35 from B&Q)
I've currently managed two coats of paint, and still have a little left in the first 5 litre paint tin. (£40/tin from B&Q)
I've been doing one coat per day, and looks good now after one of sealant and two of paint, but I reckon I'm going to aim for at least another two coats of paint before I even think about parking my cars on it.
As per previous posters, I always stick with brands I trust when it comes to paint, and there seemed to be a lot of horror stories on message boards about various other brands (which I suspect are largely down to people not following instructions / preparing surfaces, etc), but couldn't find any reviews of the Ronseal. I took this to be a good sign - after all, who bothers to post a review when nothing went wrong?
