IZOMAL stain-blocking paint seals dried water stains, soot, rust and nicotine marks before you apply water-based paint. Two coats at 2 hours each, and the ceiling is ready for ordinary interior paint without yellow ghosts coming back through the fresh finish.
A familiar story: the stain comes back
After a roof leak or a burst pipe, the ceiling is left with yellow, brown or rusty marks. It gets a fresh coat of paint, and a few days later the stain shows through again. Primer and another coat do not help. This is how most people first come to IZOMAL: after a coat of stain-blocking paint, the ceiling is finished with regular interior paint and the stains stay hidden.
How stain-blocking paint works
The pigment in most household stains dissolves in water. A water-based paint or primer wets the stain and carries it to the surface, so every new coat turns yellow again. IZOMAL is solvent-borne: it does not dissolve the stain but forms a barrier the pigment cannot pass through. Any water-based paint can go on top.
The real saving is not the price of the can but the work you skip. The alternative to stain-blocking is to strip the plaster back to the substrate, dry it, re-plaster and only then paint.
IZOMAL specifications
Parameter | Value |
|---|---|
Type | Solvent-borne stain-blocking paint |
Purpose | Sealing dried stains before water-based finishes |
Coverage | About 165 g/m² per coat |
Coats | 1 under a finish paint; at least 2 when used on its own |
Drying time per coat | 2 hours |
Colour and sheen | White, semi-matt |
Use | Interior; also exterior when used on its own |
Tools | Brush, roller, sprayer |
Which stains it blocks
- water marks and streaks after flooding;
- rust runs from rebar and pipes;
- soot and smoke after a fire, from a stove or a cooker;
- nicotine in rooms where people smoked;
- marker, coffee and wine stains.
It works on ceilings and walls made of concrete, plaster, plasterboard and other mineral substrates indoors. A useful extra: improved adhesion to surfaces previously painted with oil or alkyd enamels, so old oil paint in a hallway does not have to be stripped.
Where IZOMAL saves the most
- Flats after a flood: no need to re-plaster the ceiling.
- Homes after tenants and smokers’ rooms: nicotine is sealed under one coat.
- Kitchens: soot above the cooker (after degreasing the surface).
- Stairwells and older buildings: stains over old oil paint.
- Offices and rental units: 2 hours per coat keeps downtime short.
How to apply
- Make sure the stain is dry and the leak has been fixed.
- Remove dust and flaking layers, degrease the surface.
- Stir the paint thoroughly.
- Apply one coat (at least two, 2 hours apart, when used on its own).
- Once dry, paint the whole surface with a water-based finish.
The paint is solvent-borne, so keep the room ventilated while you work. For surface preparation by stain type and common mistakes, see how to cover stains on a ceiling after a flood.
IZOMAL or a regular primer
Parameter | IZOMAL stain-blocking paint | Deep-penetrating primer |
|---|---|---|
Base | Solvent-borne | Water-based acrylic |
Job | Blocks the stain | Consolidates the substrate, evens out absorbency |
Flood stain | Covers it | Does not stop it |
Crumbling plaster | Does not consolidate | Binds dust within the layer |
They do different jobs. If a wall is crumbling, use PROFI GRUNT deep-penetrating acrylic primer. If a wall is stained, it needs a stain blocker.
What to paint on top
- DIAMOND 2 acrylic latex paint: deep matt, class 1 wet scrub resistance, for kitchens and hallways.
- EKOFARBA acrylic paint: deep matt, for bedrooms and ceilings that are not washed.
- Barvy Pryrody acrylic paint: silky sheen, 16 ready-made colours, class 1 wet-scrub resistance.
For painting a ceiling without streaks, see the perfect DIY ceiling guide.
Limitations
- Do not apply over damp stains or wet ceilings. If mould has appeared in a damp area, deal with the cause first; see why mould appears in your home.
- IZOMAL does not fix the cause: if the leak continues, a new stain will appear nearby.
- Outdoors, IZOMAL is used only as a standalone coating on brick, concrete and rendered substrates, in at least two coats.
What to buy
For a post-flood repair, get IZOMAL stain-blocking paint for the stained area and finish paint for the whole ceiling. Work out the ceiling area with the paint coverage calculator.
FAQ
What is stain-blocking paint?
A solvent-borne paint that forms a barrier over a stain, so the stain pigment does not dissolve and bleed through the water-based coats that follow.
How many coats of IZOMAL do I need?
One coat under a water-based finish paint. Used on its own, at least two coats, 2 hours apart.
Can IZOMAL go over old oil paint?
Yes. It has improved adhesion to surfaces painted with oil and alkyd enamels. Clean and degrease the surface first.
Can I leave IZOMAL as the final coat?
Its main job is sealing before water-based finishes. On brick, concrete and rendered substrates it can be left as a standalone coating if at least two coats are applied.
