keep roof painting Away from gutter friends !

I need to warn people NEVER to use gutter friends to Paint the roof. My roof lasted less than 2 year's - the coating was sprayed on - carelessly - and the layer was so thin, it peeled off within 2 rainy seasons. yes, someone came round to have a look, due to the Guarantee promised, took one look and I never saw them again......the entire roof needed to be redone ! Could not reach them from that point............