Wire Processing: Porosity Sealants for Wire Harnesses Sep 29, 2011All day long, wire harnesses are sealed against porosity at nine Magna-Tech Manufacturing facilities located throughout North America. These wire harnesses are of different lengths, contain wire of different thicknesses, and are made by Tier 1 suppliers such as Delphi, ATPI, Siemens, Group Dekko and Federal Mogul. One Federal Mogul wire harness sealed by Magna-Tech is Author: Jim Camillo Maxi-Seal Products - Maxi-Seal Harness Systems Maxi-Seal Products. Maxi-Seal quality wire harness system is based on our dedication to continuously improve our products and service; providing maximum value to our customers. Maxi-Seals custom-engineered harness system provides the best solution for our customers wiring needs. We offer custom engineered solutions.