Abstract: The process described herein involves a method of compacting and increasing the amount of particles, such as polytetrafluoroethylene, etc., deposited in fissures in a surface which involves heating the surface to expand the size of the fissures or pores in the surface, then depositing in the expanded fissures finely divided particles at a temperature at least 100.degree. F, preferably at least 300.degree. F below the temperature of the surface, and subsequently permitting the temperature of the surface and of the particles to come to equilibrium whereby the particles are locked into the fissures by interference fit. The surface is then subjected to a blasting fluid stream carrying finely divided particles applied at a pressure of 30-120 psi, preferably 40-80 psi, to compact the particles in the fissures, after which the original treatment is repeated by heating the surface, depositing additional finely divided particles at a temperature at least 100.degree.