FORZAPRIME Bitumen primer
Solvent-based bituminous primer for torch-applied waterproofing membranes
The specified primer of the FORZAFLEX torch-on system. Dry in about 1 hour on smooth surfaces.
FORZAPRIME coverage, coats and cure times
Solvent-based bituminous primer that seals porous concrete, masonry and metal and gives torch-applied membranes a uniform key. It primes only: it is not a waterproofing membrane.
- Application rate
- 0.15–0.25 L/m²depends on substrate porosity · TDS p2
- Coats
- 1applied evenly, no ponding · TDS p2
- Dry time
- Approx. 1 hourminimum on smooth surfaces. Longer on porous or textured · TDS p2
- Apply at
- +5°C to +35°Ctypicaltypical R&D value · TDS p2
- Method
- Brush, rolleror low-pressure spray where permitted · TDS p2
- Compatible with
- 3 FORZAFLEXBASE 3mm, MINERALE 4.5 and RR · TDS p2
- Colour
- Blacktypicaltypical R&D value · TDS p2
- Shelf life
- 12 monthstypicalunopened, stored as specified · TDS p2
From the FORSPEC data sheet, TDS-FORZAPRIME · Revision 1 · 25 August 2026. Times are at 25°C and 50% relative humidity unless the data sheet says otherwise. Typical = FORSPEC’s own typical value, not a laboratory-certified one.
Where FORZAPRIME is used
Use it for
- Priming ahead of FORZAFLEX BASE 3mm, MINERALE 4.5 and RR
- Roof slabs and decks
- Podium slabs and balconies
- Retaining walls and foundations
- Lift pits and below-ground structures
- Metal substrates before membrane installation
Know before you start
- Not a waterproofing membrane: it primes, it does not waterproof
- Not a moisture barrier and not for hydrostatic pressure
- Never torch over wet primer, and never speed drying with heat or a torch
- Do not dilute unless approved in writing by an authorised FORSPEC representative
How to apply FORZAPRIME
- 01
Prepare
Concrete fully cured, with no surface moisture. Remove dust, laitance, oil and curing compounds mechanically and vacuum. Repair voids with FORBUILD 100 or FORCRETE 100. Mask adjacent surfaces.
- 02
Stir
Stir or shake FORZAPRIME thoroughly before use. Do not dilute it.
- 03
Apply
Brush, roller or low-pressure spray at 0.15–0.25 L/m², depending on porosity. Cover every patch and avoid ponding or build-up.
- 04
Dry
Allow approx. 1 hour minimum on smooth surfaces, longer on porous or textured ones. Torch only once it is dry to the touch with no solvent odour.
- 05
Clean up
Clean tools while the product is still wet, with an approved solvent where the Safety Data Sheet permits. Once dry it needs mechanical removal.
A short guide from the data sheet. Read the full FORZAPRIME TDS before you start.
FORZAPRIME questions
How long before I can torch over FORZAPRIME?
Allow approx. 1 hour minimum on smooth surfaces, longer on porous or textured ones. It must be fully dry to the touch with no solvent odour. Never speed drying with heat or a torch.
How much FORZAPRIME do I need?
Apply at 0.15–0.25 L/m², depending on how porous the surface is. Porous and textured decks use significantly more. Confirm pack sizes against the current pack schedule before ordering.
What can I use it on?
Concrete, masonry and metal substrates, ahead of FORZAFLEX BASE 3mm, MINERALE 4.5 or RR torch-applied membranes.
Is FORZAPRIME a waterproofing membrane?
No. It primes and seals the surface, it does not waterproof. It is also not a moisture barrier and not suitable for hydrostatic pressure.
Can I thin it?
No. Do not dilute it unless an authorised FORSPEC representative approves it in writing.
Why must it be fully dry before torching?
Torching over wet primer ignites residual solvent. Pooled primer will not dry through and stays as a solvent reservoir under the membrane, so avoid ponding and build-up.
Used with FORZAPRIME
FORZAPRIME TDS and SDS
Always work from the current data sheet. Every FORSPEC TDS and SDS →
Specify it. Or buy it.
Send the drawings or photos and FORSPEC comes back with the system, the details and the quantities. Or find a FORSPEC stockist for FORZAPRIME.