BASF MasterProtect HB 200
MasterProtect HB 200 (Master Builders Solutions, formerly BASF) is a single-component, high-build, water-based acrylic anti-carbonation coating for the protective coating of exposed concrete substrates with surface defects, irregularities or texture variation. The product is classified under EN 1504-2 as a coating providing principles 1 (protection against ingress) and 8 (increasing resistivity). MasterProtect HB 200 is supplied as a thixotropic paste in 15 L pails, applied by airless spray, brush or roller in one or two coats over a primer (MasterProtect P or equivalent). The high-build formulation permits application thicknesses to 350 microns dry-film per coat — significantly higher than standard anti-carbonation coatings — which permits the coating to bridge minor substrate defects, crack-bridge service cracks up to approximately 0.5 mm, and fill surface texture variation to produce a uniform finish on substrates that would otherwise require additional surface preparation. TRSC specifies MasterProtect HB 200 on facade remediation projects where the substrate has minor surface defects or texture variation that would compromise the appearance or performance of standard anti-carbonation coatings, and where the engineering intent is a single-coat-and-finish application that combines surface levelling with anti-carbonation protection.
MasterProtect HB 200 occupies a specific specification slot in TRSC's coatings library: it is the high-build anti-carbonation coating for substrates with minor surface defects or texture variation that would compromise standard coatings. The product is selected over alternatives (MasterProtect 1000, Sikagard-670 W, Mapecoat ACT) on three job profiles: (1) substrates with minor surface defects (small spalls, blowholes, surface honeycomb) that have been patched but not perfectly levelled — the high-build coating bridges these defects and produces a uniform finish without an additional surface levelling coat; (2) substrates with texture variation between original concrete and patched repair — typical on facade remediation where patches have been finished with a slightly different surface texture to the surrounding original concrete; the high-build coating evens out the visible texture transition; (3) crack-bridging requirement — MasterProtect HB 200 carries crack-bridging capacity of up to approximately 0.5 mm, which is meaningfully higher than the 0.3 mm of standard anti-carbonation coatings; for substrates with documented service crack widths in the 0.3-0.5 mm range, the high-build product is the engineering choice. The most common specification pitfalls TRSC encounters in the field are: (1) over-application of dry-film thickness — the high-build product can be over-applied to produce excessive film thickness that develops surface drying skin while remaining wet beneath, leading to surface defects on subsequent coat application; the contractor must respect the manufacturer-published per-coat dry-film thickness limit (typically 350 microns) and apply additional coats if required; (2) substrate moisture — like all water-based acrylic coatings, MasterProtect HB 200 requires a dry substrate at primer and coating application; substrates that are visibly damp will produce coatings with poor adhesion that delaminate within 12-24 months; (3) recoat interval — the high-build product has an extended recoat interval (typically 12-24 hours at +20°C) compared to standard coatings; field installations that re-coat within the manufacturer-published minimum interval produce coatings with inter-coat adhesion failure. TRSC remediation specifications that nominate MasterProtect HB 200 include the dry-film thickness target per coat, the maximum permitted dry-film thickness per coat, the primer specification, and a witness hold point at the end of each application phase.