Mask construction is stainless steel plate with nickel electroform where needed for an extra critical mask. Electroforms are made from a lay-up of an actual molded part. This process enables a great deal of detail to be picked up for an accurate paint application. the layup process permits a certain measure of clearance to be built into the electroform allowing for some part to part variation.
There are many applications that don’t require the robust nature of a metal mask. This is where plastic vacuum formed masking enters in. These masks are relatively inexpensive and easy to produce. Plastics masks can typically be delivered in a short span of time. Their main downside is a loss of accuracy compared with metal masking.