I got comfortable with gaskets and gasket-making while working on cars. If the tech repair youtube still hasn't mastered this art I'd suggest looking at automot

I got comfortable with gaskets and gasket-making while working on cars. If the tech repair youtube still hasn't mastered this art I'd suggest looking at automotive youtube. Prepare the substrate, use the right silicone for your materials, use gap-preventing technique, and you can make it happen with high reliability even if you don't have an ultrasound to check your work. Your grandpa didn't have an ultrasound and his automotive gaskets had to put up with a lot more abuse than your phone ever will. There was no magic then and there's no magic now. You can do it too.