Ignoring the measurements as an example. It depends on gap recommendations.
12mm of sealant all over the top of the keel joint. Tighten down to 8 mm gap. Allow to cure. Then torque up to recommended setting. Gap will now be circa 5mm.
First tightening action squeezes excess sealant out and ensures consistent coverage. Second tightening squeezes the now cured gasket up to torque required.
That's the way most modern gaskets sealants are applied now. Never fully tightened whilst still liquid.
