Marson® Mar-Glass® polyester filler is reinforced with short-strand fiberglass to create waterproof repairs that are twice the strength of ordinary body fillers.
Thicker and More Malleable
3M™ Short Strand Reinforced Filler is thicker than regular filler, so it requires a bit more effort to mix. Compared to long strand fiberglass filler, short strand filler is also a bit more malleable and softer. Fiberglass filler is great for applying over welded areas and can be used as a build layer where thicker applications of body filler are needed.
A Unique Line of Reinforced Filler Products from 3M
Altogether, the 3M line of reinforced filler products offer users a unique and flexible array of repair solutions (PDF, 504.4 Kb). Each product is reinforced with short fiberglass strands, long fiberglass strands or milled fiberglass. These reinforced fillers are significantly stronger than regular fillers and are waterproof. They are great for repairing fiberglass and rust holes in metal.
Repairing and rebuilding rusted-out metal or damaged fiberglass materials in automotive applications