Multichem Group produces External Wall Coating covers Hairline Cracks. Multichem Group is engaged in manufacturing of construction chemicals. This Multi-guard Walcoat is a fluid-applied, 100% acrylic elastomeric designed to waterproof exterior vertical surfaces. It possesses outstanding adhesion to a wide variety of substrates. It is permanently flexible breathing membrane. It effectively covers existing hairline cracks and repaired areas, and bridges hairline cracking caused by further building movement. Walcoat is available in multiple standard natural toned colors.