Use withISOPON P.40 Body Filler for holes to form a tough and durable repair. X1 UPOL Isopon P38 Filler. X1 UPOL Isopon P40 Filler. UPOL Isopon P38 polyester filler is a two-component chemical paste used for the filling of holes and imperfections in surfaces such as steel and GRP.
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