Method for refurbishing waste water systems

摘要

A technique and device for rehabilitating or repairing wastewater system components or the like, comprising a spray-applied, multi-layer liner (10) which seals the components and imparts structural integrity. The liner (10) comprises a primer layer (11), a first moisture barrier layer (12), a foam layer (13), and a second moisture barrier layer (14). The first and second moisture barrier layers (12, 14) are preferably made of the same material and form a skin on both sides of the internal foam layer. The combination of the foam layer (13) and the two moisture barrier layers (12, 14) imparts structural strength and rigidity to the cured liner. Preferably, the primer layer (11) is an epoxy, the moisture barrier layers (12, 14) a polyurea and isocyanate blend, and the foam layer (13) a polyurethane.