Repair Cracked Roof Box

1 to what ss7 said drill a small hole at each end of the crack.

Repair cracked roof box.

West systems epoxy makes a gflex kit specifically for plastic boat repair. Roof boxes are generally made of abs. I used fiberglass kit auto b. A clean surface is vital as it will.

Bought a new one to replace it for the owner but did a perfectly good repair with sikaflex on the cracked one which lasted perfectly well but wasn t. Initially in the late 1990s we would apply abs patches cut pieces of abs plastic attached by abs cement to the hole or cracked section of the box. Our box repair methods have come a long way over the past decade or so. Also look for pulled or missing nails at the base s bottom edge.

In this video i repaired my thule cargo carrier box. Check for cracked housings on plastic roof vents and broken seams on metal ones. Replace them with rubber washered screws. We applied a layer of abs cement to the surface of the box laid down a layer of fiberglass and brushed more cement on until it was saturated.

Wipe the area clean using alcohol wipes. It have several cracks a couple of holes and was in bad need of painting. There s really no fix other than replacing the damaged vents. The other method is plastic welding which can be diy with the proper hot air welder or any body shop that has one.

Cleaning the crack you must first clean the cracked area to ensure that the repair material will bond. We repeated with a second layer using a slightly larger fiberglass patch. You might be tempted to throw caulk at the problem but that solution won t last long. This would be a pretty good solution but ran the risk of coming apart after a couple of years.

We lightly sanded down the area of the crack extending 6 8 all around. Working on the inside of the box start by sanding the area around the break.