Then work the epoxy into the crack with a mixing stick or a small brush, or inject the epoxy using a syringe. Step 6: Apply the epoxyįix the roof box into a position where gravity will pull epoxy into the crack. It has a pot life of 45 minutes, so you’ll have plenty of time to make the repair carefully. G/flex is very easy to use, as it just needs a simple 1:1 ratio by volume of resin and hardener. Mix a small batch of WEST SYSTEM G/flex epoxy, making sure you mix it thoroughly. Even a hairdryer will do it! Do not overheat or you may cause further damage. Heating the resin and hardener before mixing them will lower the epoxy’s viscosity, allowing it to penetrate deeper into cracks.Īlso gently heat the area to be repaired with a heat gun. No obvious change takes place, but the flame oxidises the surface and dramatically improves adhesion with adhesives and coatings applied over it. Allow the flame to touch the surface, but keep it moving – about 30 to 40 cm per second. Pass the flame of a propane torch across the surface quickly. A clean surface is vital as it will ensure a strong bond. The coarser the grit of the sandpaper (around 80 grit should do it), the better the adhesion to the epoxy. Working on the inside of the box, start by sanding the area around the break. A number of handy kits are also available to suit different uses and projects.īelow is the suggested approach. G/flex is available in two viscosities: 650 Epoxy, a versatile, easily modified liquid epoxy and 655 Epoxy Adhesive, a convenient pre-thickened epoxy. G/flex is ideal for roof boxes, as it makes structural bonds that absorb the stresses of expansion, contraction, shock and vibration. I recommend using the WEST SYSTEM G/flex® epoxy range, along with some fibreglass cloth. So it’s good to know that you can make an ultra-strong repair for around the £20 mark – with the help of some epoxy resin. Roof boxes are expensive, costing anywhere from £100 to more than £200. They’d tried to put a larger-than-normal item into the box and it had cracked. I recently heard from someone who’d broken the lid of their roof box near the hinges. Here, Hamish shares his know-how to help you mend and save money.
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Amongst the flurry of emails this month was a query about how to fix a broken roof box. Technical guru Hamish Cook is always on hand to answer your epoxy-related questions.
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