• Does the repairer perform all the work “in house”, or do they sub-contract it out?
• Does the repairer have full engineering facilities, or do they rely on third parties?
• What experience does the repairer have?
• Who are his key clients?
• Is the repairer the principal product supplier and the applicator, i.e. is the service a “Supply and Apply” full service?

Obviously a repairer who supplies the product and applies it, in house, and without relying on third parties is a more reliable repairer, with less exposure to factors contributing to a sub-standard repair.

Experience in the industry and a good track record are also added insurance to a quality repair.