try, try again. So I did. But that attempt doesn't look good either! So, after a long thunk, came up with another idea. Going to take up the "raging sea" theme & do another on canvas (one & two were on watercolour board). Had a spare deep-edge canvas the right size. The canvas was a bit loose, so bashed in the stretchers. Nuts. Stretchers too long or I bashed too hard. One of'em pierced the side & t'others made very visible marks. Maybe I shouldn't buy cheapo canvases!!