Easier Installation / Removal
When comparing a custom-molded mask, like this one, to using tape/cardboard or even die-cuts, it's no contest when it comes to installation and removal time.
Tier-1 suppliers need to optimize their line's efficiencies, and the paint line is almost always the biggest bottleneck. The biggest fear for many customers is the initial investment in tooling. Due to high line output, making the switch to custom-molded masking can pay off extremely quickly.
The tier-1 manufacturer was able to pay off their initial tooling investment in under a month via labor savings and higher part quality.
Color-Coded for Assembly
Design for assembly (DFA) is a really big deal, especially in the automotive industry, and something as simple as color-coding each piece (i.e. Orange cap for driver side, Green for passenger side, etc.) can make all the difference for assembly line workers.
Silicone has excellent temperature resistance, and because the molded masks they were using were large and not exposed to harsh chemicals or extreme heat, the customer was able to get well over 75 uses before needing to replace them.
A huge benefit they got from switching away from red-iron oxide silicone (which we'll go into more detail) was that the paint was much easier for them to snap off of the mask after several uses, giving them the ability to reuse.