409 Microsphere Blend
A pure white, hollow glass bubble based, low density filler designed for filling and fairing of fibreglass. When the filler is mixed with West System epoxy at a ratio of 10% to 25% by weight, it creates a smooth creamy paste for filling and fairing over glassfibre repairs. The cured epoxy/filler is very easy to sand. Being white in colour the cured mix will be easily hidden behind paint or polyester gelcoat but must be protected by further coats of epoxy if used below the waterline.