Acrylic waterproofing systems deliver a seamless, long-lasting waterproof coating that is UV stable, weather resistant and low maintenance. Unlike torch-on systems applied in overlapping sheets, a liquid rubber acrylic system like HydroSeal HF covers the entire surface as a single seamless membrane — eliminating joints, overlaps and the weak points where leaks typically develop. The system is water-based, eco-friendly, non-toxic and easy to apply by brush, roller or airless spray. It moves with the structure, can be colour matched to any roof and performs best when used as part of a complete reinforced waterproofing system.
For flat concrete roofs and slabs, HydroSeal HF performs best as the final topcoat of the SealPro ArmTec HyperFlex Waterproofing System. This is a fully bonded, seamless, reinforced waterproofing system that uses Penetrar as a surface primer, Flex with StretchSeal membrane for all crack and joint detail work, ArmTec mesh embedded with HyperFlex across the full slab surface, and HydroSeal HF applied in two coats as the final waterproof topcoat. This system delivers significantly better long-term performance on slabs and flat roofs than a standalone coating — reinforcing the membrane against structural movement, ponding water and UV degradation.
The recommended system is the SealPro ArmTec HyperFlex Waterproofing System, installed as follows:
Step 1 — Clean the slab. Remove all old or failed waterproofing, sweep away all dust and loose debris. The surface must be clean, dry and sound.
Step 2 — Inspect for cracks and cavities. Fill all imperfections with Posi Screed. Open all full bore outlets and use Posi Screed to shape and slope the sides towards the drain for proper water flow.
Step 3 — Prime the entire slab with SealPro Penetrar. This binds any remaining dust and promotes strong adhesion for the waterproofing layers to follow.
Step 4 — Reinforce all fixed cracks and joints using SealPro Flex — apply a layer of Flex, embed StretchSeal membrane into the wet Flex coat, then saturate the membrane with a second coat of Flex.
Step 5 — Install 45° cement flashings in all internal corners where the roof meets a parapet wall.
Step 6 — Roll out the ArmTec mesh and shape it to fit the section being waterproofed.
Step 7 — Embed the ArmTec mesh by applying HyperFlex directly over it — pressing down to ensure HyperFlex penetrates completely through the mesh and secures it to the slab.
Step 8 — Seal all full bore outlets using the StretchSeal Flex membrane system, ensuring the membrane is sealed directly onto the casing section of the outlet. Strengthen all parapet wall cement flashings by embedding StretchSeal membrane with Flex.
Step 9 — Once the surface is touch dry and walkable, apply the first coat of HydroSeal HF evenly across the entire section.
Step 10 — Once the first coat is completely dry, apply the final topcoat of HydroSeal HF to complete the system.
The recommended system for a pitched concrete tile roof is: wash and degrease the tile roof surface thoroughly, apply SealPro Penetrar as a tile roof primer to bind and stabilise the surface, fill any cracked tiles and damaged areas with Posi Screed, embed StretchSeal membrane with Flex over all ridges, valleys and tile joints as part of the StretchSeal Roof Ridge Waterproofing System, then apply a minimum of two coats of HydroSeal HF as the final liquid rubberised roof coating. HydroSeal HF seals the tile surface, bridges fine cracks and provides durable UV stable roof protection in the colour of your choice.
The metal roof system is: wash and degrease the roof surface thoroughly to remove all rust, grease and loose material. Apply SealPro Flex as part of the StretchSeal Flex system on all vulnerable details — screwlines, lap joints, overlaps, flashings and ridge caps — bedding StretchSeal membrane into the wet Flex coat and applying a second Flex coat over the membrane. Once the detail work is complete, apply SealPro Purple Prime as an all-metal roof primer across the full roof surface, then apply HydroSeal HF as the rubberised liquid rubber topcoat over the entire roof in a minimum of two coats. HydroSeal HF waterproofs and finishes the full roof surface — protecting against rain, UV exposure and corrosion.
The ArmTec HyperFlex system uses the following SealPro products, each with a specific role:
Penetrar — Surface primer. Binds dust and promotes adhesion on the concrete slab before any waterproofing layers are applied.
Posi Screed — Used to fill all cracks, cavities and imperfections, and to shape and slope surfaces towards drainage outlets before priming and waterproofing.
Flex — Applied with StretchSeal membrane to reinforce all fixed cracks, joints, full bore outlets and parapet wall flashings before the mesh is laid.
StretchSeal membrane — Embedded into Flex at all cracks, joints, outlets and corners — providing a reinforced, movement-tolerant seal at every vulnerable detail.
ArmTec mesh — Rolled out and shaped across the full slab surface, then embedded with HyperFlex. Forms the structural reinforcing layer of the waterproofing system.
HyperFlex — Applied over the ArmTec mesh, pressing down to penetrate completely through the mesh and secure it to the slab.
HydroSeal HF — Applied in two coats as the final topcoat over the entire system — providing the seamless, flexible, UV stable liquid rubber waterproof finish.
They are two separate products used at different stages of the ArmTec HyperFlex system. HyperFlex is used to embed the ArmTec mesh into the slab — it is the bonding and embedding agent for the reinforcing layer. HydroSeal HF is the final topcoat applied in two coats over the entire cured system — it provides the seamless liquid rubber waterproof finish and UV protection. Neither product can be substituted for the other within the system.
No. HydroSeal HF requires SealPro UltraBond WP as an adhesion primer before it can bond over existing torch-on or bitumen surfaces. UltraBond WP is a two-part cementitious primer that bonds to virtually any surface — including torch-on, bitumen, sealed slabs and painted surfaces — creating the adhesion layer that HydroSeal HF then bonds to. Never apply HydroSeal HF directly over torch-on without UltraBond WP applied first.
Over time torch-on overlaps and drain ends crack and separate — exposing the slab beneath. The restoration system is: clean the surface thoroughly and remove all failed waterproofing, apply SealPro UltraBond WP over the entire torch-on surface as a cementitious adhesion primer, fill all failing joints and cracks with Posi Screed, embed StretchSeal membrane with Flex over all cracked areas and failing overlaps, then install the full ArmTec HyperFlex system — rolling out the ArmTec mesh, embedding with HyperFlex, and finishing with two coats of HydroSeal HF. The ArmTec HyperFlex system is specifically designed for torch-on restoration and refurbishment.
The correct primer depends on the substrate. On concrete slabs as part of the ArmTec HyperFlex system — apply SealPro Penetrar first, then complete the full system before applying HydroSeal HF as the topcoat. On tile roofs — apply SealPro Penetrar. On metal roofs — apply SealPro Purple Prime. On torch-on, bitumen or any sealed non-porous surface — apply SealPro UltraBond WP. Always prime before applying HydroSeal HF for optimal adhesion and long-term performance.
Yes. HydroSeal HF is used as a flexible liquid rubber raincoat on exterior cement and plastered walls. Prime the surface with SealPro Penetrar first, then apply HydroSeal HF as the raincoat layer in two coats. Once fully cured, any topcoat paint from any supplier can be applied directly over the HydroSeal HF surface — making it compatible with any existing wall painting system without restricting your choice of colour or paint brand.
Yes. Once HydroSeal HF has fully cured on a wall surface, any topcoat paint from any supplier can be applied over it. This makes HydroSeal HF an ideal flexible raincoat layer under any wall painting system — adding waterproof protection without restricting your choice of colour or paint brand.
HydroSeal HF is used in the StretchSeal Roof Ridge Waterproofing System as the final flexible waterproof coating over roof ridges, valleys and tile joints on pitched tiled roofs. It is applied over the StretchSeal membrane that has been embedded with Flex over all ridge and valley details — encapsulating the membrane and providing long-term protection against water ingress and structural movement.
HydroSeal HF is used in the StretchSeal Roof Ridge Waterproofing System as the final flexible waterproof coating over roof ridges, valleys and tile joints on pitched tiled roofs. It is applied over the StretchSeal membrane that has been embedded with Flex over all ridge and valley details — encapsulating the membrane and providing long-term protection against water ingress and structural movement.
HydroSeal HF is touch dry in one to two hours under normal conditions. Full mechanical curing takes seven days. Do not expose freshly applied HydroSeal HF to rain or foot traffic until fully cured. Allow each coat to dry completely before applying the next — in the ArmTec HyperFlex system, wait until the first coat is completely dry before applying the final topcoat.
HydroSeal HF covers approximately 5 square metres per litre per coat. Coverage will vary depending on the porosity and condition of the substrate. In the ArmTec HyperFlex system, ensure full, even coverage over the entire slab in each of the two topcoat layers — these two coats of HydroSeal HF form the final seamless waterproof barrier of the system.
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