[Henry Schmidt]

The goal in assembling the 911 case halves is sealing the joint not gluing the case halves together. The hardware creates the mechanical joint.
The challenge when using Loctite 574 to seal the engine case is the speed at which it hardens and the fact that it hardens at all. It is anaerobic which means it starts hardening in the absence of oxygen.
If the sealant hardens to produce it's sealing efficiency, it must be compressed quickly and with consistency. In the case of the video, there is too much sealant applied to the wrong half of the case.
574 was the go to for years but things have changed. Adhesive chemistry has changed.
What we discovered is that 574 can offer a shear strength so we use it on the main webs in performance engines when shuffle pins are not an option. This technique requires an expertise not exhibited in the video. Speed is of the essence.
Instead of gluing the case halves together (574) we have opted for a liquid gasket technique. The sealant (Dirko HT Grey) is applied to the loose case halve (the half not on the stand). The liquid gasket is applied in a very thin, smooth and consistent layer.
Within about 4 minute the product will start to skin over. This is of no concern. When the case halves are torqued together the sealant squeezes out leaving a very thin layer between and around the compressed components. The curing time is then about 4 hours. The two components are now attached together with a thin bead of sealant on both sides of the seem.
This newer technique eliminates the need for speed in assembly and is flexible enough to resist cracks and breakaway during heat cycles. This is especially important with magnesium cases that grow and shrink excessively during normal run cycles.
574 hardens to create a seal and if that product is moved after hardening it can crack.

As for the "silk tread". Fluff with no real benefit. Sometimes old school is based in misconception as to why something was done.
Case in point: boat tailing 911 cases....zero benefit at the cost of main web stability.