anyone have any recomendations for edging a rigid plastic pond? The problem is the shape is an irregular curve, sort of figure of eight but with a straight-ish side. I don't mind mortaring down some sort of paving block or slab, it's just I'd rther not try and point them... always seem to make a mess of that bit. The main reasonfor wanting to edge the pond is because of the black plastic lip of the pond that will be exposed. Also, the pond is surrounded by landscaping gravel, which I'd rather not have to keep fishing out of the pond!