Is it your first paint today?

Today it was a useful day for my speaking. I was in a pub having a paint of beer while I waited my friend, when two men in theirs early fifty had started to talk with me. It was at evening and they was having paints before work. The conversation started when one of them asked me “is it your first paint today?” When they found out I was foreign we started to talk about the reason I'm in Stafford. I think we had understood quite a lot.
I had tried to justify my poor English, and one of them said me “don't worry, my Spanish is worst”