One-part and water-based — stirred and applied straight from the pail by brush or roller
Primer for absorbent concrete, render, brick, stone and tiles before SealForce AC10
Rayson SealForce AP05
Rayson SealForce AP05 is a one-part, water-based acrylic primer for the SealForce waterproofing range — brushed or rolled onto concrete, render, brick, stone and roof tiles to seal pores, bind dust and give SealForce AC10 a firm surface to bond to.
Best for
Best for absorbent, dusty or smooth surfaces on roofs and external walls — concrete, render, brick, stone and unglazed or clay tiles — before the SealForce AC10 acrylic membrane goes on.
Real product · Interactive depth view Rayson SealForce
Product system Rayson SealForce AP05
20 kg pail RY-TDS-1107
Rayson SealForce AP05 has one clearly defined, verifiable job in the coating system.
Rayson SealForce AP05 is a one-part, water-based acrylic primer for the SealForce waterproofing range — brushed or rolled onto concrete, render, brick, stone and roof tiles to seal pores, bind dust and give SealForce AC10 a firm surface to bond to. Best for absorbent, dusty or smooth surfaces on roofs and external walls — concrete, render, brick, stone and unglazed or clay tiles — before the SealForce AC10 acrylic membrane goes on.
Improves the bond of SealForce AC10 to concrete, render, masonry and tiles
Bonding primer on smooth, dense concrete finishes
Seals pores so the membrane cures without bubbles or pinholes
Binding surface dust and firming weak surface layers before the membrane
Seal the pores. Then the membrane holds.
A one-part, water-based acrylic primer that binds dust, seals pores and dries clear on concrete, masonry and tiles before SealForce AC10.
A controlled route to applying Rayson SealForce AP05.
This sequence supports early planning. It does not replace the current Technical Data Sheet, approved method statement or project-specific technical review.
- 01
Inspect and prepare the substrate
Concrete and cementitious surfaces: sound, with a pull-off strength of at least 1.5 N/mm², at least 28 days old and mechanically prepared to an open texture
- 02
Prepare the material as specified
One part, ready to use — stir for about 2 minutes with a slow paddle until uniform, without whipping in air
- 03
Apply with the correct tools
Recommended methods: Brush, Roller. Confirm coat count and thickness for the project.
- 04
Protect through the required cure
Dry when the milky white has turned clear — at least 1 hour, longer in cool or humid weather. Apply SealForce AC10 within 24 hours, cleaning the surface first if longer. Protect from rain until dry
Coating system cutaway
Every layer has a job—from prepared substrate to service surface.
This diagram explains a typical system position, not a fixed specification. Primer, body coat, finish, thickness and detailing must be confirmed for the project.
Position in the system Primer
Rayson SealForce AP05 serves as the primer. Confirm the complete build-up against the substrate, exposure and project requirements.
Related system products
Review primers, body layers, finishes or specialist components connected to this product.
- Rayson SealForce AP05Primer · Acrylic
- Approved primer / baseIncluded when required by the system design
- Correctly prepared substrateConcrete and cementitious surfaces: sound, with a pull-off strength of at least 1.5 N/mm², at least 28 days old and mechanically prepared to an open texture
Four project facts for faster system screening.
These current product figures support early selection. Confirm the final build-up, quantity and application conditions against the Technical Data Sheet and site conditions.
- Coverage
- Coverage
- Mixing & working time
- Mixing
- Drying & curing
- Curing
- Pack configuration
- Pack
Approximately 0.15–0.3 kg/m² per coat, depending on absorbency; a 20 kg pail primes about 65–130 m² per coat. Very porous surfaces take a second coat
One part, ready to use — stir for about 2 minutes with a slow paddle until uniform, without whipping in air
Dry when the milky white has turned clear — at least 1 hour, longer in cool or humid weather. Apply SealForce AC10 within 24 hours, cleaning the surface first if longer. Protect from rain until dry
20 kg pail
Confirm the substrate and real service environment before specifying.
Choose it when
- Primer for absorbent concrete, render, brick, stone and tiles before SealForce AC10
- Bonding primer on smooth, dense concrete finishes
- Binding surface dust and firming weak surface layers before the membrane
- Sealing pores in rough concrete so the membrane cures without bubbles or pinholes
Relevant applications
Relevant industries
Choose something else when
- A primer, not a waterproofing layer: always cover it with SealForce AC10
- Apply between +10 °C and +35 °C, at no more than 75% relative humidity, with the substrate at least 3 °C above the dew point
- Substrate moisture at most 5% by weight; no standing water and no rising moisture
- Protect from rain until dry
- Not for use under the polyurea membranes — SealForce RC40, RC30, SP200 and SP210 take the primer named in their own data sheets
- Metal needs an anti-corrosion primer instead; on glazed tiles, sound old coatings or other dense surfaces, confirm adhesion with a trial area first
- Floors under water-based urethane finishes — use Rayson PrimeBond W10
- Under the polyurea membranes SealForce RC40, RC30, SP200 and SP210
- Under SealForce WB20 in toilets and bathrooms, which needs no primer
- Use on its own as a sealer or finish — it must be covered by SealForce AC10
Other Rayson products to evaluate
These links continue the comparison; they are not automatic substitutes. Confirm the substrate, exposure and complete build-up before selection.
Substrate requirements+
- Concrete and cementitious surfaces: sound, with a pull-off strength of at least 1.5 N/mm², at least 28 days old and mechanically prepared to an open texture
- Brick and stone with sound, flush-pointed mortar joints; loose units replaced
- Unglazed ceramic tiles and clay roof tiles, securely fixed, with broken or missing tiles replaced
- All surfaces power-washed or vacuumed free of dust, and dry: moisture at most 5% by weight, with no standing water or rising moisture
Technical documents and project support
Ready to specify Rayson SealForce AP05? Give Rayson the site conditions.
Send the area, substrate condition, expected traffic or exposure, required finish and programme. The technical team can help review the system build-up and estimated quantity.
What to know before specifying Rayson SealForce AP05.
What is SealForce AP05 used for?
It prepares concrete, render, brick, stone and roof tiles for SealForce AC10, the acrylic roof and wall membrane: a bonding primer on smooth concrete, a pore sealer on rough concrete, and a dust binder on weathered masonry and tiles. It is brushed or rolled on, dries clear and is always covered by the membrane.
Which Rayson waterproofing membranes need it?
SealForce AC10, on concrete, render, brick, stone and tiles. SealForce WB20 does not: it goes straight onto the prepared screed or concrete of a toilet or bathroom. The polyurea membranes, SealForce RC40, RC30, SP200 and SP210, each take the primer named in their own data sheets, not AP05. Metal under AC10 takes an anti-corrosion metal primer.
How much do I need?
About 0.15 to 0.3 kg/m² per coat, depending on how absorbent the surface is; a 20 kg pail primes about 65 to 130 m² per coat. Very porous concrete, brick or tiles take a second coat, and a small test area shows the real figure for each surface.
How long before the membrane goes on?
Until the milky white has turned completely clear: at least 1 hour, longer in cool or humid weather. Apply SealForce AC10 within 24 hours of priming, and clean the surface first if it has waited longer. Protect the primer from rain until it is dry.
Can it go on old roof tiles, brick or stone?
Yes, once the surface is sound: loose tiles or bricks fixed, broken ones replaced, open joints pointed, and the surface power-washed and dried. It suits unglazed ceramic and clay tiles; on glazed tiles or other dense surfaces, a trial area confirms adhesion first.
SealForce AP05 or PrimeBond W10: what is the difference?
Both are one-part, water-based acrylic primers, for different systems. AP05 is the SealForce waterproofing primer for roofs and external walls under SealForce AC10. PrimeBond W10 is the floor primer under Rayson's low-odour water-based urethane finishes, such as UraForce WB52.
Can it be left on its own as a sealer?
No. It binds dust and seals pores ahead of the membrane, but it is not a waterproofing layer or a wearing surface. It must be covered by SealForce AC10.
Is SealForce AP05 available to order now?
SealForce AP05 is part of Rayson's upcoming waterproofing release, alongside SealForce AC10. Send the project details and your required date, and Rayson will confirm supply timing, quantities and, where you need one, an applicator in the Rayson network before you commit.
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