Puma wrote:
There is no harm at all in painting render after a couple of days. Rewetting the render with the paint does not affect the hydration chemistry at all aside from accelerating it very very briefly. You can also thin paint as much as you want as long as it doesn't settle out into its constituent parts, you would have to leave it to pool for a good while for this to happen, through pigments can separate out quickly in low viscousity watery media. It is right that you shouldn't use a cheap paint as a primer.
You can save money making your first coat white - there are often offers on this. My personal preference is to use a masonry sealer (water based), the second and third coats then tend to sit on top and even out the texture. This isn't so important if there is a nice finish (the plasterers have bothered to wet sponge.Click to expand...
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