I'm about to repaint the exterior timber of my daughter's home (windows & fascias) which have been painted with Taubmans Sunproof low sheen acrylic Monument colour. Is it better if I buy Dulux Weathershield which I've used at my place and been happy with it. Not sure but I think Dulux is more expensive. I'm only after a 4 litre can. Any advice would be appreciated thanks. Cheers Frank