Installing a sealed topper

• 1). Locate the leak in an installed topper. Mark the location, then remove the topper in order to inspect and repair the seal.
  
  
• 2). Inspect the topper and edge of the pickup bed for anything protruding which would keep the topper from sitting firmly on the truck bed. Old foam tape is often a culprit. Scrape, wash, or remove anything that might keep the topper from compressing the seal. Many newer pickups have a heavy rubber seal built into the bottom of the topper edge. Inspect the heavy seal for rips, cracks, or any sticks, rocks, or other debris that could inhibit a good seal.
  
  
• 3). Install the foam tape along the edge of the truck, sticky side down. Set the topper on the bed of the truck. Do not slide the topper on the tape. Sliding will cause the tape to tear, and you will get leaks at the tear locations. You must actually pick it up and set it down.
  
  
• 4). Re-inspect the seal once the topper is set in place. From inside the truck bed, look for any visible daylight. Lift and place foam tape into any visible openings.
  
  
• 5). Bolt or clamp the topper in place.