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When I questioned them about why they were diluting the paint, they said it was necessary in order for the paint to come out smoother.
Many times on a day that is either to hot or usually cold, thinning paint is a normal practice. Yes thinning will make it come out smoother. The job talk is ( when you can't brush it out, thin it out)
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Is this true that you normally mix paint with water or are they just trying to save money? If so, should painting the inside of house also require diluting the paint with water
If they are trying to save money then the jokes on them as bal1 mentioned here in coats. It's a hair split here. Don't know site conditions/temps
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If so, should painting the inside of house also require diluting the paint with water
99% of the time that's not done unless you are spraying inside or out. Or again to cold.
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Diluting paint gets you no where
Some site temps require thinning of paint that's brushed on. It also depends on the quality of the paint which is basically how much pigment is put in it. I use Benjamin Moore which is a top quality paint and on occasions I need to thin it out
The only time any paint is thinned out/diluted is because it's a really HOT day painting an exterior door and the paint needs to be thinner to brush out better and not leave brush makes. Painting in the sun on a hot material is usually when that is done to a paint( it gets sticky). Then it's a gamble. Diluting paint too much not only weakens the paint it also cause the sheen to be duller.
Dilution is only done in very SMALL quantities at best.