Insulating the graphics card, we will use three main things. Firstly, we will coat the PCB with nail polish (a conformal spray could also be used). Secondly, we use closed cell foam to insulate around the core to the liquid nitrogen container when mounted to stop air getting in and forming condensation. And lastly, Vaseline will also be applied as another barrier on the cards PCI-E slot and the motherboard.
To make the gasket that fits around the core, I first make a template out of paper so I can make multiple identical gaskets easily.
To apply the Vaseline I use a small paint brush, as can be seen in the video back on the first page.