Soudal’s video guide to sealing around a window frame with silicone or other sealants.
For glazing and weather-sealing, use Pereseal N, a low-odour neutral-cure silicone, or Pereseal 802. For aluminium frames that will be painted, use the acrylic Pereseal 702. To fix and insulate the frame in the opening, use PU foam such as Soudafoam Gun.