I'm making a 1/18 garage scene and having trouble with the floor. I just can't seem to get to look right. What colours and technique should I be doing to get the concrete garage floor look.
Real concrete comes in all sorts of shades of grey - and many concrete floors in garages are painted anyway. So, I would suggest any shade of grey that looks OK to you.
I've used Halfords sprays to replicate aircraft hardstandings in the past.