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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Painting freshly plastered walls
Hi guys
Currently mid way through our ensuite re-furb and my mind has turned from plumbing to painting. All walls and ceiling have been skimmed and is now fully dry (plastered about 3 weeks ago). I am thinking of taking the opportunity whilst no shower enclosure / toilet / basin / vanity unit are installed to give the ceiling a lick of paint, also may paint the walls where we are not tiling. What is the best method for painting fresh plaster? How many coats will be required? Do I need mix some cheap emulsion with PVA (50-50) for the initial base coat? TIA |
#2
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Painting freshly plastered walls
Slider wrote:
Hi guys Currently mid way through our ensuite re-furb and my mind has turned from plumbing to painting. All walls and ceiling have been skimmed and is now fully dry (plastered about 3 weeks ago). I am thinking of taking the opportunity whilst no shower enclosure / toilet / basin / vanity unit are installed to give the ceiling a lick of paint, also may paint the walls where we are not tiling. What is the best method for painting fresh plaster? How many coats will be required? Do I need mix some cheap emulsion with PVA (50-50) for the initial base coat? TIA IME Crown emulsion has always been fine straight from the tin. |
#3
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Painting freshly plastered walls
On 13 Jun, 11:01, "Slider" wrote:
Hi guys Currently mid way through our ensuite re-furb and my mind has turned from plumbing to painting. All walls and ceiling have been skimmed and is now fully dry (plastered about 3 weeks ago). I am thinking of taking the opportunity whilst no shower enclosure / toilet / basin / vanity unit are installed to give the ceiling a lick of paint, also may paint the walls where we are not tiling. What is the best method for painting fresh plaster? How many coats will be required? Do I need mix some cheap emulsion with PVA (50-50) for the initial base coat? TIA Fresh dry plaster will absorb the liquid from the paint too quickly and the paint will end up either pealing off or dry and dusty. Usual recommendation is a watered down first coat, but you can just paint it with water first to stop the suction. Or seal the plaster first with a "plaster sealer" (expensive). I do not believe PVA is good in this instance - tends to form a skin unless watered down itself. Also PVA might not be compatible with a paint that does not use PVA its makeup. Remember the problem is the suction of dry plaster, similar to the suction of dry bricks sucking moisture from mortar. The implies that the paint needs it's liquid (water ? something else ?) as part of it's drying / setting method. Anyone know about the chemistry of emulsion paint ? Simon. |
#4
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Painting freshly plastered walls
sm_jamieson wrote:
On 13 Jun, 11:01, "Slider" wrote: Hi guys Currently mid way through our ensuite re-furb and my mind has turned from plumbing to painting. All walls and ceiling have been skimmed and is now fully dry (plastered about 3 weeks ago). I am thinking of taking the opportunity whilst no shower enclosure / toilet / basin / vanity unit are installed to give the ceiling a lick of paint, also may paint the walls where we are not tiling. What is the best method for painting fresh plaster? How many coats will be required? Do I need mix some cheap emulsion with PVA (50-50) for the initial base coat? TIA Fresh dry plaster will absorb the liquid from the paint too quickly and the paint will end up either pealing off or dry and dusty. Usual recommendation is a watered down first coat, but you can just paint it with water first to stop the suction. Or seal the plaster first with a "plaster sealer" (expensive). I do not believe PVA is good in this instance - tends to form a skin unless watered down itself. Also PVA might not be compatible with a paint that does not use PVA its makeup. Remember the problem is the suction of dry plaster, similar to the suction of dry bricks sucking moisture from mortar. The implies that the paint needs it's liquid (water ? something else ?) as part of it's drying / setting method. Anyone know about the chemistry of emulsion paint ? Simon. Only that the water and the solvents shouldn't be absorbed at a different rate to the resin/pigments. It doesn't matter with the smaller particle size emulsions, but they produce stains rather than paints. Thinning emulsions is like adding water to custard. However much you whip it, it's forever separate |
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