Pond Construction » G4 Pond Sealer » G4 Pond Sealer Green

G4 is a moisture cured, one component polyurethane which forms a non-porous, tough, durable but flexible seal. Seals porous substrates such as concrete, brick and porous stone. G4 will not seal concrete block or lightweight block, these need to be cement rendered before application of G4.

G4 Blue special order Same price as Black