In article .com,
" says...
At this time of the year the net goes up in the garden and it would be
nice to be able to draw a few court lines. I phoned the local sports
shop and they don't stock pots of line marking paint.

I wondered if i could use old emulsion paint! Has anyone tried this?
Would it kill the grass? Does anyone know?

Can you not just grind some chalk and mix it with water?