Paint the Inside of an Outhouse for Easy Cleaning Written By Walters Withey64 terça-feira, 9 de agosto de 2022 Add Comment Edit The previous owners had painted the walls in the outside toilet but the paint was flaking off so i decided to remove it all so i can paint it again. I have started to remove the paint and it is coming off the bricks easy but there is a white chalky stuff left on the bricks but i'm wondering if they painted lime on the bricks before painting and that is the reason why the paint was flaking in the first place. When i removed all the paint and wash the walls should i put anything on the bricks before using masonry paint as i don't want it flaking off again. They probably have used a lime wash (same as white wash). Any paint going on top of this will be less hydrophilic (water attracting) than the lime wash, so the damp will gather in the Lime Wash and, in short, the other paint won't stick to it. You will need to scrub clean or, lime wash again. Lucozade wash the walls down then give them a coat of Dulux primer/sealer and then you can paint them with the paint of your choice as the sealer will hold back any lime wash that was on the walls. cheers mate polly Lucozade, When you have done a thorough job of removing this material, within reason, then a coat of Dulux Primer/Sealer, as suggested by Polly, should be fine. I noticed that you asked about Stabilising Solution on the Screwfix Forum. You could use this if you want, in replacement of the Primer/Sealer, but in an enclosed space like a WC, without a good quality respirator I think you may be asking for a severe headache from the evaporating solvent. Limewash and whitewash are not the same material. A simple limewash is made from freshly slaked lime mixed with additional water. Further waterproofing substances can be added, especially if it is to be used outside. Whitewash is just a cheap distemper which is based on whiting and loosely bound, usually with glue size or casein for a washable version. Whitewash cannot be used outside. I agree with Polly with regard to the primer/sealer, and Goodwill is spot on with the use of a stabiliser. Potty. Hello Goodwill, It is deceptive but because you start with two different chemicals and they end up curing to the same substance - calcite, refer to Wikipedia. One of the forms of calcite is chalk as in the white powdery stuff! Any kind of sealer will make the transformation from calcite to chalk accellerate. Any water vapour now, not just being held in by the hydroscopic nature of the Caco3 will now condense in winter as it hits the impermeable cold barrier of the sealer and will condense. It becomes a cycle. The carbonic acid naturally found in water will denature the crystalline structure of the calcite to CHALK. Don't paint chalk. AN OUTSIDE TOILET? FOR CHRIST SAKE THIS IS THE 21st CENTURY AN OUTSIDE TOILET? FOR CHRIST SAKE THIS IS THE 21st CENTURY Yeah! all the rage now, coming back into fashion, I can generally cover these in a one coat especially after a few pints and a vindaloo! I notice that no one has mentioned eflourescence on this subject. This could be a possibility and should be treated as such. Britney, From a practical point of view, limewash becomes insoluble, although it needs recoating approximately every 18 months or less, whitewash remains soluble. On the assumption that it is either limewash or whitewash on these walls, then following the preparation previously mention on this thread, the product recommended by Polly will do a satisfactory job of binding any powdery material left behind. It will also even the porosity of the surface. Taking account of the OP's presentation, I am confident that Polly's recommendation of Dulux Primer/Sealer (brushed on) is the correct, practical solution to this problem. Big Jim, So what would you recommend? Scrape all old paint off good scrub with stiff brush to remove powder residue and as you said Dulux sealer primer Big Jim, If it definitely turned out to be efflorescence, which I doubt from the OP's description, then I would use an alkali resisting primer rather than a primer/sealer. Goodwill Very good point indeed should have paid more attention ....... Share This Page libbygeory1950.blogspot.com Source: https://community.screwfix.com/threads/painting-outside-toilet.92877/ Share this post
The previous owners had painted the walls in the outside toilet but the paint was flaking off so i decided to remove it all so i can paint it again. I have started to remove the paint and it is coming off the bricks easy but there is a white chalky stuff left on the bricks but i'm wondering if they painted lime on the bricks before painting and that is the reason why the paint was flaking in the first place. When i removed all the paint and wash the walls should i put anything on the bricks before using masonry paint as i don't want it flaking off again.
They probably have used a lime wash (same as white wash). Any paint going on top of this will be less hydrophilic (water attracting) than the lime wash, so the damp will gather in the Lime Wash and, in short, the other paint won't stick to it. You will need to scrub clean or, lime wash again.
Lucozade wash the walls down then give them a coat of Dulux primer/sealer and then you can paint them with the paint of your choice as the sealer will hold back any lime wash that was on the walls. cheers mate polly
Lucozade, When you have done a thorough job of removing this material, within reason, then a coat of Dulux Primer/Sealer, as suggested by Polly, should be fine. I noticed that you asked about Stabilising Solution on the Screwfix Forum. You could use this if you want, in replacement of the Primer/Sealer, but in an enclosed space like a WC, without a good quality respirator I think you may be asking for a severe headache from the evaporating solvent. Limewash and whitewash are not the same material. A simple limewash is made from freshly slaked lime mixed with additional water. Further waterproofing substances can be added, especially if it is to be used outside. Whitewash is just a cheap distemper which is based on whiting and loosely bound, usually with glue size or casein for a washable version. Whitewash cannot be used outside.
I agree with Polly with regard to the primer/sealer, and Goodwill is spot on with the use of a stabiliser. Potty.
Hello Goodwill, It is deceptive but because you start with two different chemicals and they end up curing to the same substance - calcite, refer to Wikipedia. One of the forms of calcite is chalk as in the white powdery stuff! Any kind of sealer will make the transformation from calcite to chalk accellerate. Any water vapour now, not just being held in by the hydroscopic nature of the Caco3 will now condense in winter as it hits the impermeable cold barrier of the sealer and will condense. It becomes a cycle. The carbonic acid naturally found in water will denature the crystalline structure of the calcite to CHALK. Don't paint chalk.
AN OUTSIDE TOILET? FOR CHRIST SAKE THIS IS THE 21st CENTURY Yeah! all the rage now, coming back into fashion, I can generally cover these in a one coat especially after a few pints and a vindaloo!
I notice that no one has mentioned eflourescence on this subject. This could be a possibility and should be treated as such.
Britney, From a practical point of view, limewash becomes insoluble, although it needs recoating approximately every 18 months or less, whitewash remains soluble. On the assumption that it is either limewash or whitewash on these walls, then following the preparation previously mention on this thread, the product recommended by Polly will do a satisfactory job of binding any powdery material left behind. It will also even the porosity of the surface. Taking account of the OP's presentation, I am confident that Polly's recommendation of Dulux Primer/Sealer (brushed on) is the correct, practical solution to this problem.
Scrape all old paint off good scrub with stiff brush to remove powder residue and as you said Dulux sealer primer
Big Jim, If it definitely turned out to be efflorescence, which I doubt from the OP's description, then I would use an alkali resisting primer rather than a primer/sealer.
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