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c. Use solvent to remove oil and grease, wiping the surfaces with <br />clean white rags only. <br />2. Remove protective coatings on steel by sandblasting or by using a <br />solvent which leaves no residue. <br /> <br />C. Aluminum surfaces: <br />1. Aluminum surfaces in contact with sealant: <br />a. Remove temporary protective coatings, dirt, oil, and grease. <br />b. When masking tape is used for protective cover, remove the tape <br />just prior to applying the sealant. <br />2. Use only such solvents to remove protective coatings as are <br />recommended for the purpose by the manufacturer of the aluminum work, <br />and which are non-staining. <br /> <br />3.3 INSTALLATION OF BACKUP MATERIAL <br /> <br />A. When using backup of tube or rod stock, avoid lengthwise stretching of the <br />material. Do not twist or braid hose or rod backup stock. <br />B. Installation tool: <br />1. For installation of backup material, provide a blunt-surfaced tool of wood <br />or plastic, having shoulders designed to ride on the adjacent finished <br />surface and a protrusion of the required dimensions to assure uniform <br />depth of backup material below the sealant. <br />2. Do not, under any circumstance, use a screwdriver or similar tool for this <br />purpose. <br />3. Using the approved tool, smoothly and uniformly place the backup <br />material to the depth indicated on the Drawings or otherwise required, <br />compressing the backup material 25% to 50% and securing a positive fit. <br /> <br />3.4 PRIMING <br /> <br />A. Use only the primer recommended by the manufacturer of the sealant, and <br />approved by the Architect/Engineer for the particular installation, applying in strict <br />Architect/Engineer. <br /> <br />3.5 BOND-BREAKER INSTALLATION <br /> <br />A. Provide an approved bond-breaker where recommended by the manufacturer of <br />the sealant, and where directed by the Architect/Engineer, adhering strictly to the <br />installation recommendations as approved by the Architect/Engineer. <br /> <br />3.6 INSTALLATION OF SEALANTS <br /> <br />A. Prior to start of installation in each joint, verify the joint type according to details <br />on the Drawings, or as otherwise directed by the Engineer, and verify that the <br />required proportion of width of joint to depth of joint has been secured. <br /> <br />B. Equipment: <br /> <br />SEALANTS AND CAULKING <br />07920-6 <br /> <br />