In building canopies and platforms I have been and still am beset my all manner of pestilence, but I must admit I am so pleased these have not included yellow lines on the platform. A faded white line appears to be more than sufficient in the early 60s. Happy carefree days , jumpers for goalposts, lettuce and Bovril sandwiches ........I admire your persistence and can't wait to see the full effect with canopies on