There are many ancillary materials that are used in a vacuum bag cure process. Ancillary materials are those materials that are used to aid and assist the curing process to achieve the required fiber-resin ratio and also provide the ability to produce a patch that bonds to the part and not to other materials.
Upon following the process of the layup for the part, ensure the vacuum bag has no leaks and is pulled down tight over the repair area (no bridging). A poor vacuum bag will not provide adequate contact between the thermocouples, heat blanket, and repair area to allow proper heat transfer for uniform heating and stable control.
Special attention to this detail may be required at the areas where the electrical leads and thermocouples penetrate the vacuum bag sealant tape and pass-through at the perimeter of the repair layup.