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Our builder has plastered several walls. He recommends using trade paint because he says using that we don't need to dilute the first coat. This was news to me, is this right?
i would agree, the purose of diluting paint is to make it thinner to allow it to soak into the new plaster, so is your builder saying that all trade paint is thin and diluted??
The new plaster will be “thirsty”. Thinning the first coat by 25-50% allows the excess moisture to be taken in by the plaster without drying out the paint. If you don’t water down the plaster will take in too much moisture from the paint and your first coat will set as an over dry and poorly adhered layer. If this happens every subsequent coat relies on this one for grip to the wall. It will fail.
Trade paints are designed to be watered down to the particular situation/desire of decorator for all kinds of reasons. They are thick by design. For your first or ‘mist’ coat you should use a bog standard big shed white emulsion. For the love of god don’t buy that crap that the big brands sell as “fresh plaster paint”. It’s watered down paint for more money!!!!
Do it right. Do it once.
I spoke to a paint manufacturer years ago and they dont recommend mist coats.
speak to the technical dept of the paint manufacturer to see what they say rather posting on a forum!
Thanks for your opinions. In a way you are all right. We decided to call the tech. dept of Leyland. They always recommend letting down paint with 15-20% water on first coat on new plaster.
your builder doesnt know what hes talking about, you did the correct thing in contacting technical advice of the manufacturer, they should of advised to apply 3 coats of contract emulsion with the first coat being thinned by whatever percentage they recommend. contract emulsion is designed to be used on new building work walls, its microporous which means it allows any residual moisture in the substrate to dry out through it without damaging it. the downside is it isnt a very tough coating, it doesnt wipe down at all. i wouldnt actually use it in a domestic situation unless the walls were slightly damp and decoration was urgent, id just go with trade quality vinyl matt emulsion or if a higher degree of maintenance was required one of the branded scrubbable emulsions which clean better but come at a price. if you have painted the walls with contract emulsion itll be fine, its used in most new build houses, next time you decorate go for a trade quality vinyl matt from a manufacturers outlet or independent merchant serving the trade, the quality of paint is noticeably superior to retail outlets