Difference between revisions of "Stain block"
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Stains on emulsion [[paint]]work often bleed through when painted over, and repeated coats of emulsion fail to block them. A coat of any of the following can stop this happening: | Stains on emulsion [[paint]]work often bleed through when painted over, and repeated coats of emulsion fail to block them. A coat of any of the following can stop this happening: | ||
| − | * | + | * Dilute [[Adhesive|PVA]] |
* Oil based (alkyd) non-gloss paint, such as undercoat or eggshell | * Oil based (alkyd) non-gloss paint, such as undercoat or eggshell | ||
| + | * Acrylic paint | ||
* Stain block paint | * Stain block paint | ||
* Shellac | * Shellac | ||
| − | One or 2 coats is normally enough, but not always. Water based stain blocks aren't as powerful as oil based paints, and the very worst stains can require | + | One or 2 coats is normally enough, but not always. Water based stain blocks aren't as powerful as oil based paints, and the very worst stains can require either [[oil]] based [[paint]] or alternating coats of emulsion and acrylic. |
| − | [[Adhesive|PVA]] should always be diluted when used. Otherwise it can form a slick surface that [[paint]] won't stick to. | + | [[Adhesive|PVA]] should always be diluted when used, and don't overdo it. Otherwise it can form a slick surface that [[paint]] won't stick to. |
The staining of walls by [[fire]] is a bit different to [[water]] staining, and aluminium primer is favoured. This forms a layer of aluminium flakes, blocking [[Cleaning|odour]] as well as soluble stains. | The staining of walls by [[fire]] is a bit different to [[water]] staining, and aluminium primer is favoured. This forms a layer of aluminium flakes, blocking [[Cleaning|odour]] as well as soluble stains. | ||
Latest revision as of 03:58, 9 February 2013
Stains on emulsion paintwork often bleed through when painted over, and repeated coats of emulsion fail to block them. A coat of any of the following can stop this happening:
- Dilute PVA
- Oil based (alkyd) non-gloss paint, such as undercoat or eggshell
- Acrylic paint
- Stain block paint
- Shellac
One or 2 coats is normally enough, but not always. Water based stain blocks aren't as powerful as oil based paints, and the very worst stains can require either oil based paint or alternating coats of emulsion and acrylic.
PVA should always be diluted when used, and don't overdo it. Otherwise it can form a slick surface that paint won't stick to.
The staining of walls by fire is a bit different to water staining, and aluminium primer is favoured. This forms a layer of aluminium flakes, blocking odour as well as soluble stains.