Paint - Bumper Refinishing: Overview
Group: PAINTNumber: 99-99-002
Date: SEPTEMBER, 1999
Model: ALL MODELS
Subject: BUMPER PAINT REFINISHING
DESCRIPTION:
This bulletin outlines the basic procedures for refinishing a Hyundai bumper. It applies to both collision repair work and non-collision repair work. Included are five paint manufacturer's plastic refinish procedures for their products on Hyundai OEM bumpers.
On vehicles where the paint has peeled from the bumper without impact damage or debris damage, warranty repairs may be made inside the normal paint warranty period with normal authorization approval.
BUMPER REFINISH BASICS:
Basic bumper refinish procedures always involve cleaning and scuff sanding the plastic. This is because the plastics used for most bumpers have a low "Surface Energy", and they may have residual amounts of contaminants and mold releases on the surface which further reduce the surface energy.
Surface energy is related to surface tension. Low surface energy (tension) will make the paint bead up on the bumper like water on a freshly waxed hood. It will not wet the complete surface but will bead up into spots. By thoroughly washing the surface, those contaminants are removed, increasing the surface energy of the plastic. Scuff sanding with a fine abrasive, such as a 3M Scotchbrite pad or sandpaper, will give the paint a rough surface to stick to.
BUMPER REFINISH PROCEDURES:
The procedures attached are for the brands of paint listed. Please see your paint supplier to obtain the specific repair procedures for the paint to be used. All paint procedures have the same general process:
- Clean the plastic
- Scuff the plastic
- Clean the plastic again
- Apply adhesion promoter or special primer
- Apply basecoat / Clearcoat paint
Hyundai bumpers are manufactured using several different types of plastics. The type of plastic the bumpers are made of is molded into the side of each bumper skin. The chart below summarizes the plastic types for recent Hyundai models. The plastic type may or may not affect the type of adhesion promoter required.
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