Tool assembly for manufacturing parts and a method of producing a tool assembly

A method comprising:

• receiving a tool assembly including a plurality of layers defining at least one part-cavity and plurality of cooling channels;
• pouring sealant into the plurality of cooling channels;
• pressurizing the sealant to a pressure for a pressurization period;
• and
• applying a centrifugal force to the tool assembly to remove excess sealant from the tool assembly at a rotational velocity between approximately seventy-five revolutions per minute up to approximately one hundred and twenty-five revolutions per minute for at least three minutes, wherein the sealant extends between the plurality of layers.

A tool assembly, comprising:

• an upper half defining at least one part cavity and a plurality of cooling channels;
• and
• a lower half defining at least one part cavity and a plurality of cooling channels,
• wherein each cooling channel of the plurality of cooling channels defines a surface that includes a pressurized and cured sealant extending between one or more layers and that coats the surface.