Editing Epoxy primer (section)
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==Body filler and epoxy primer== Body filler and high-build primers can be used on top of epoxy primer. Although body filler is commonly applied to bare metal, applying epoxy primer before the filler adds adhesion, corrosion protection, and durability. Body filler is thought to be best applied over epoxy primer within the primer's recoat window time. Epoxy is porous while curing. The body fillers are designed to attach to a rough surface and can put their strands into the porous surface of the epoxy. As the body filler heats up while it cures, it causes the epoxy under it to cure faster too. As the epoxy cures, the holes close up around the strands of the body filler, creating a stronger bond. Commercial body shops may not use epoxy primer under body filler because it's not time-efficient. An extra day must be allowed in the repair process for the epoxy to begin curing before filler can be applied. However, some car manufacturers specifically require epoxy primer to be used under body filler for certain applications.
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