Abstract: A method and assembly for forming a compression seal about a stud in a base, for the purpose of effecting repairs in coatings over the base. The method comprises forming a compression seal about a stud in a base which comprises placing layers of a compressible sealing material on the base material about the stud. The layers are placed parallel to the base, and a relatively rigid material is placed over the compressible material so that the stud extends through both the compressible material and rigid material. The layers of the compressible material are compressed into sealing relationship by applying force to the rigid material in a direction against the base and only normal to the base; and securing and sealing the rigid material to the stud to maintain such compression, thus forming a seal to the base material about the stud. The assembly comprise a stud secured to said vessel wall and having a partially threaded portion inserted in the breach and a second portion exposed at said lining surface.