Hi Guy, and Ladies...
I painting (spraying) a weathered fence (6' x 50')on the back of my garden and would like a white-washed finish. I can buy a white latex stain or I've read that I can just water down some white exterior latex paint. Any suggestions?
Yes, you could water down some exterior latex, that's basically what the stain is, paint with higher water content, and perhaps a bit more resin.
In order to get a higher resin content, and if you haven't bought the exterior paint already, I would get 'semi-gloss'. They have more resin or there wouldn't be any gloss. I would hesitate to water down a flat as you will be diluting the resin too much.
I would think a pint to a quart of water to a gallon of top shelf semi would give you the effect you want.
As for the 'penetration' lingo in the paint industry, it is taught in 'paint sales 101', used to mesmerize the home owner. ANYTHING thinned down will 'penetrate' more, but I say so what?, it will also deteriorate faster. And stains deteriorate faster than paints, no way around it ..... they don't tell you that.
Just be aware that your 'wash' look will have to be redone more often, as the UV rays will not have solid pigment to bounce off of and will be able to penetrate the 'resin' more, WHICH is what breaks down the coating.