41 00... Bonding Aluminum On Aluminum: Flame-Coating

Go over the bonding surfaces slowly with the flame.
Avoid flaming with the blue part of the flame.
Condensation water appears on the area that is still uncoated. The condensation water in the line of the flame must evaporate completely.
Directly after flaming, coat the still hot bonding surfaces (approx. 50°C) with primer.