An encasement for coating a bone plate with a substrate includes a sidewall structure having an upper edge and a cover disposed on the upper edge of the sidewall structure. The encasement includes a base from which the sidewall structure rises such that the sidewall structure, the cover and the base combine to create an open interior space of the encasement. An aperture in the sidewall structure provides access to the open interior space of the encasement and a plurality of cover protrusions extend from the cover into the open interior space. The encasement further includes a plurality of base protrusions extending from the base directly opposing the plurality of cover protrusions. A combined height of an individual cover protrusion and an opposing base protrusion is less than or equal to a height of the sidewall structure.
