Fold and Secure the Corner

What happens here

Once the composite siding is heated and pliable, apply a generous bead of specialized construction adhesive along the length of the V-groove. Immediately after applying the adhesive, carefully fold the siding along the routed groove, bringing the two halves together to form a sharp 90-degree corner. Use a speed square or another reliable squaring tool to ensure the corner is perfectly square while the adhesive begins to set. For a quicker and stronger bond, spray an adhesive accelerator onto the adhesive after folding. Hold the corner firmly in place for a few moments as the adhesive cures.

Goal: Create a strong and precisely angled corner joint