Hollins, sadly I am not fluent but I understand a bit, but between Mrs.Gwynant and I we came up with:-
"Do you want your old windows painting,
Your house,school,shop or vestry,
Or name for your Pub or Hotel,
A pretty new whipping (chwip?) sign,
Or your company name on your van,
Phone Idris, he's your man."
It seemed so odd to see this sign on a slate fence post way up on a mountain path miles from anywhere but especially from where Idris the Painter lives in Morfa Bychan, Ynys Mon. He's obviously taken a lot of trouble to do and the words and rhyme are by a Twm Morris.