I use a product that is called Flotec, I believe. It is available at Home
Depot. It thins, but also makes it flow on with a LOT (LOT!) less brush
marks and stipple. You can add a tad of water, but be careful. This
Flotec(I think that is it, will make sure tomorrow when I look in my shop)
is GOOD stuff.
Or, at least that has been my experience.
Regular latex house paints are water base, mostly water, so water thins
them fine. Floetrol can be used to actualy make them brush easier but is
expensive and not necessary. The difference between many cheap lines of
one company and their top line can be just water %. A trick to getting
cheap paint to cover can be leaving the top off a 5 and letting water
evaporate for a few days to weeks, stiring every day. So where you read
water is not the right thinner for latex house paint is pure BS
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