Difference between revisions of "Mould Resistant Paint"
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| − | + | ==Chemicals== | |
| − | + | Any one of these gives paint significant mould resistance: | |
| − | + | Finely crush 16 aspirin tablets, it must be completely powdered, mix into 2.5 litres of [[paint]]. Let it stand 5 minutes then mix again. | |
| − | * | + | * The salicylate will react with water to form salicylic acid. |
| − | * Add a pinch of alum to a can of [[Paint|paint]] and mix. For [[Paint|oil paints]] the alum must be finely powdered. | + | Add a pinch of a powdered copper compound to a can of [[Paint|paint]], and mix in. Some copper compounds are toxic if ingested in more than miniscule amounts, so wash hands afterwards. |
| + | * If the copper compound is not soluble in the [[Paint|paint]] then it must be finely powdered before adding. | ||
| + | |||
| + | Add a pinch of alum to a can of [[Paint|paint]] and mix. For [[Paint|oil paints]] the alum must be finely powdered. | ||
| + | |||
| + | Combine more than one additives for maximum mould resistance. | ||
| + | |||
| + | With oil based paints all additives need to be very finely powdered. Water based paints dissolve the above additives, making this less important. | ||
| + | |||
| + | |||
| + | ==Care== | ||
| + | Most of these additives are water soluble, which raises the potential for them to simply be leached out of the paint by repeated condensation. Having used such formulae for years I can only say it works anyway, perhaps partly because the condensation evaporates away, leaving the mould proofer where it is, or perhaps for other reasons. However, one simple rule applies if you want it to work long term: don't repeatedly wipe the wall down when its damp, if you do you'll remove the mouldproofer. | ||
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==See Also== | ==See Also== | ||
| − | [[Special:Allpages|Wiki Contents]] | + | * [[Special:Allpages|Wiki Contents]] |
| − | + | * [[Special:Categories|Wiki Subject Categories]] | |
| − | [[Special:Categories|Wiki Subject Categories]] | ||
Revision as of 22:43, 18 May 2009
The best solution to mould is to prevent it by drying the room. Mould resistant paint is a good second line strategy. It is possible to buy mould resistant paint, but it is also easy enough to make the paint you already have mould resistant.
These work with both water and oil based paints.
Chemicals
Any one of these gives paint significant mould resistance:
Finely crush 16 aspirin tablets, it must be completely powdered, mix into 2.5 litres of paint. Let it stand 5 minutes then mix again.
- The salicylate will react with water to form salicylic acid.
Add a pinch of a powdered copper compound to a can of paint, and mix in. Some copper compounds are toxic if ingested in more than miniscule amounts, so wash hands afterwards.
- If the copper compound is not soluble in the paint then it must be finely powdered before adding.
Add a pinch of alum to a can of paint and mix. For oil paints the alum must be finely powdered.
Combine more than one additives for maximum mould resistance.
With oil based paints all additives need to be very finely powdered. Water based paints dissolve the above additives, making this less important.
Care
Most of these additives are water soluble, which raises the potential for them to simply be leached out of the paint by repeated condensation. Having used such formulae for years I can only say it works anyway, perhaps partly because the condensation evaporates away, leaving the mould proofer where it is, or perhaps for other reasons. However, one simple rule applies if you want it to work long term: don't repeatedly wipe the wall down when its damp, if you do you'll remove the mouldproofer.