About MC-Bauchemie MC-DUR 100

MC-DUR 100 sits at the base of MC-Bauchemie’s MC-DUR resin flooring system as the priming and sealing layer. It is a two-component epoxy resin: a base and a hardener that are supplied in matched, pre-weighed packs and combined at the point of use. Once mixed and rolled onto a properly prepared concrete slab, the resin wicks into the open pore structure of the surface, consolidates weak laitance-prone zones and cures into a hard, chemically bonded film. That film does two jobs at once. It shuts down the constant fine dusting that untreated industrial concrete produces, and it presents a clean, receptive surface for the coloured MC-DUR coatings and self-levelling floors that follow.

On an Indian project this primer is rarely the finished floor on its own; it is the step that decides whether the whole system lasts. Concrete straight off the shutter or the power trowel is variable, dusty and often contaminated with curing compound, and any resin laid directly onto it is gambling on adhesion. MC-DUR 100 removes that gamble. For contractors and consultants it is the specification detail that separates a floor that peels in the first monsoon from one that stays keyed to the slab for years. Space Arc Engineering supplies it as an authorised MC-Bauchemie channel, with the matching topcoats and site guidance to complete the build-up.

The technical insight

Adhesion in a resin floor is won or lost at the concrete interface, and that is exactly where a primer works. Untreated concrete has an open, porous top layer plus a weak, dusty skin of laitance; drop a viscous coloured coating straight onto it and the coating bridges the pores instead of gripping them, so the bond depends on a crumbly surface that shears away under traffic. A low-viscosity epoxy primer like MC-DUR 100 is thin enough to be drawn into those pores by capillary action before it gels. As the epoxy and hardener react, they cure inside the concrete’s own pore network rather than merely sitting on top of it, effectively stitching the resin film to the substrate and locking down the loose laitance in the process. The result is a mechanical-plus-chemical key: the primer is anchored in the slab, and the topcoat is anchored in the primer. This is also why substrate strength matters. MC-Bauchemie specifies a minimum concrete compressive strength above 25 N/mm² and a pull-off strength of around 1.5 N/mm² for its MC-DUR sealers, because the weakest layer in the sandwich is the concrete itself, not the resin.

Where it is used

• Priming and sealing new concrete floors before MC-DUR coloured coatings and self-levelling toppings
• Dust-proofing plain concrete in warehouses, godowns and logistics floors where a full colour coat is not needed
• Sealing and consolidating floors in chemical, pharmaceutical and fertiliser plants ahead of a resistant topcoat
• Preparing food-processing, dairy and bottling-plant floors for a hygienic, easy-clean finish
• Priming car park decks, garages, service bays and petrol-station forecourts exposed to oil and fuel
• Consolidating dusty or slightly porous slabs so a resin mortar or screed will bond reliably
• Sealing plinths, bunds and equipment pads before chemical-resistant lining

Key advantages

• Low viscosity lets the resin penetrate deep into the concrete pore structure for a genuine mechanical key
• Binds down surface laitance and stops fine dusting from untreated concrete
• Two-component epoxy cures into a hard, chemically resistant film rather than a soft skin
• Purpose-matched to the MC-DUR coating and self-levelling range for a warrantable system build-up
• Resists diesel, dilute acids and alkalis and many organic solvents once cured
• Applied simply by brush, roller or squeegee, so it suits most site crews and shift windows
• Pre-weighed base and hardener packs remove on-site batching errors
• Backed by MC-Bauchemie India technical support through Space Arc as an authorised channel

Limitations & considerations

• It is a primer-sealer, not a wearing floor on its own; heavy-traffic areas still need an MC-DUR topcoat over it
• Only as strong as the slab beneath it, which must meet the >25 N/mm² compressive and ~1.5 N/mm² pull-off minimums
• Demands thorough mechanical preparation; laitance, curing compound, oil and loose material must be removed first
• Sensitive to hot, dry conditions; MC-DUR sealers should not be applied once surface temperature climbs past about 35 degrees C
• Pot life is finite once base and hardener are combined, so only mix what the crew can lay before it thickens
• Epoxy primers can amber or lose gloss under UV, so where appearance is critical the topcoat, not the primer, provides the finish

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie MC-DUR 100

Treat MC-DUR 100 as the first coat in a system, not a standalone product. It is specified with the MC-DUR coloured coatings and self-levelling floors that go over it, and with MC-Bauchemie repair mortars used to fill honeycombs, pinholes and bug holes in the slab before priming. Where a floor faces heavy chemical attack or wheeled traffic, the primer stays the same but the topcoat is chosen for the duty. If a project is standardised on Fosroc, the equivalent build-up starts with Nitoprime 25 under the Nitoflor floor coatings, and Space Arc can supply either family as an authorised channel. The right call is usually driven by which coating system the specification or the client’s maintenance stock already favours, since the primer should always match its own topcoat.

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