The topcoat by design for Si-Prime penetrating primer, Si-Rex03 Silicone Resin Emulsion Paint (SREP) is a dynamic protective coating for concrete and masonry substrates with active water repellency, industry-leading breathability and proven durability and performance.

Designed specifically for use with Si-Rex03, the use of penetrating primer Si-Prime on bare substrates adds to the performance, durability and substrate protection traits of the Silicone Resin Emulsion Paint (SREP) coating system.

For use on cast-in-place concrete, precast concrete, stucco, blockwork (CMU), brickwork, stone and other substrates.

Klaas Coatings (North America) LLC
PO Box 25122
Dallas, TX 75225-1122

T: 866-317-3633 (toll free)
F: 214-363-8422


Markets We Supply

Transportation Infrastructure
Parking Structures
Office Buildings
Commercial and Retail
Warehousing and Distribution
Precast Concrete Fabricators
Historic Structures
Sport Complexes
Condominiums and Multi-Family
Tourism Infrastructure
Schools and Colleges

Technical Support

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All orders supplied ex-factory – products not available through retailers.

Some regional building product distributors may carry, or order in, product as needed.

Product packaging
(packed volume by weight):

Si-Rex03 - 5 Gallon Pail or 55 Gallon Drum
Si-Prime - 5 Gallon Pail

Si-Rex03 orders are custom batch tinted at factory. Batch tinting ensures exact same color pail-to-pail. Minimum Order Quantities (MOQ) apply; contact for details.