Thursday, 05 April 2007 15:08

A unique bedliner repair

Written by I-CAR Advantage Online
 Like spraying paint, application of a spray-on bedliner may have flaws in the appearance that need to be corrected before delivery to the customer. These flaws include drips, runs, sags, or bubbles in the bedliner material. Traditional repair generally requires removing the damaged area, filling the area with plastic repair material or bedliner material, and recoating the bed with another layer of bedliner material.
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 Nissan, along with PPG, has developed a new bedliner repair kit that can be used to repair minor problems without having to recoat the entire bed. This kit is used to repair small defects, generally no more than 25 mm (1”) in diameter.
 For in-depth repair steps, please refer to the technical service bulletin (TSB) (#NTB05-002a), which can be accessed at www.nissantechinfo.com.
Repairing a damaged bedliner
 This repair process is designed to fix deep gouges in the bedliner surface. It is also designed to repair blemishes in the bedliner such as scrapes, drips, runs, sags, etc. When repairing the drips, runs, and sags, it is recommended to first determine if there is uncured bedliner material beneath the damaged area. This may happen if the spray-on bedliner is not properly mixed and drips onto the surface of the bed.
 When repairing the area, it is first cleaned using soap and water followed by wiping the area with acetone (see Figure 1). Next, a bedliner texture imprint is made. This imprint is made by applying an impression material to an undamaged portion of the bedliner (see Figure 2). A cover plate is placed over the impression material and slight pressure is applied to the plate (see Figure 3). This ensures that the impression material flows into all areas of the bedliner for the most accurate textured appearance. The material is left to dry for 15 minutes and peeled from the bedliner surface (see Figure 4).
 
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Next, the defects in the bedliner are removed from the bed. This can be done using a rotary cutting tool, a heat gun and scraper, or an induction heater and scraper. It is recommended to remove only enough material to correct the damage. The area is cleaned with acetone and primer is applied, if necessary (see Figure 5). Next, the repair area is filled with the Nissan-recommended bedliner repair material (CAT128 and RBDL 1724). This product is available as a two-part cartridge and is dispensed with an applicator that is equipped with a 140 mm (6”) applicator tip (see Figure 6).
 After properly prepping the cartridge, the bedliner material is dispensed onto the damaged area, making sure to only place enough material to fill the area. Next, the bedliner impression material is placed over the repair material, texture side down. A cover plate and magnet are placed over the top of the impression material and firmly pressed into place (see Figure 7). The magnet is used to hold the plate in place. After 15 minutes, the magnet, cover plate, and impression material are removed and the work is inspected (see Figure 8). If the area is too low, repeat the application steps to bring the repair area up to the proper level. If the area is too high, shave down the repair area and repeat the application steps.
 Once the area has been repaired properly, with the appearance of the repair matching the surrounding bedliner, the patch must be allowed to cure. The product can be force-cured with an infrared heat lamp, however, it’s important not to exceed 49°C (120°F). The product can also be cured at room temperature, but the rate of cure will be dependent on the temperature. For example, if room temperature is below 35°C (95°F), the material will take 16–24 hours to cure. If room temperature is above 35°C (95°F), the bedliner material will take 2–6 hours to cure. During the curing process, the material should not be exposed to any moisture.
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Removing blisters with cured bedliner
 To remove a blister or sag that has cured bedliner material beneath the defect, the area is cleaned and a slit is cut into the blister (see Figure 9). The edges of the blister are carefully lifted and acetone is used to clean beneath it (see Figure 10). Like the previous procedure, a texture imprint will be required. After making the imprint, a small amount of Loctite 380 Black Max® is applied through the slit and under the blister (see Figure 11).
 Next, the impression material, along with a magnet and cover plate, are applied over the repair area and held in place with hand pressure for 15 seconds. The impression material, cover plate, and magnet should be left in place for another 5 minutes to allow the Loctite 380 Black Max to cure. After 5 minutes, the impression material is removed and the repair is checked for proper appearance and cleaned of any excess Loctite® material. After cleaning, the impression material, plate, and magnet are reinstalled over the repair area and the Loctite material is allowed to cure for one hour.
Conclusion
 Nissan has issued a TSB regarding recommendations on how to repair defects on spray-on bedliners and provides a spray-on bedliner repair kit for the repair (part #999MP-7S20AP). These repair recommendations are provided in detail in TSB #NTB05-002a. These bedliner repair methods are unique when compared to the general methods that are detailed in the Spray-On Bedliners online training program. To review this program, please go to www.i-caronlinetraining.com.
 For comments or suggestions on the Advantage Online, please contact I-CAR Senior Instructional Designer Bob Jansen at bob_jansen@i-car.com.
 This article first appeared in the I-CAR Advantage Online, which is published and distributed free of charge. I-CAR, the Inter-Industry Conference on Auto Collision Repair, is a not-for-profit international training organization that researches and develops quality technical education programs related to collision repair.
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