TM 10-5430-237-12&P 0018 00 0018 00-3 7.  Undercut fine edges of the hole with razor knife (Item 17, Table 1).  Scuff the mating surfaces of both the tank and patch(es) with scuffing brush (Item 2, Table 1).  Roughened area on tank should extend approximately 1 inch (2.5 cm) on all sides beyond the surface where the patch(es) will be installed. 8.  Brush away loose contamination and degrease again if needed. NOTE One can of Surface Conditioner should cover approximately 6.5 sq. ft. (0.63 sq.   meters).  All mixing and application tools should be cleaned immediately after   use with Cleaner/Degreaser. 9.  Immediately brush a thin, even coat of Surface Conditioner (Item 3, Table 1) onto the area of the tank to be patched.  Use the brush (Item 8, Table 1) as a stipple to ensure the thinnest possible film.                                                                                         NOTE The touch dry time will be dependent on the ambient temperature and relative   humidity.  The touch dry time at 68°F (200C) and 50% relative humidity will be   20 to 30 minutes.  Overcoating of Surface Conditioner with Fluid Elastomer   (adhesive) must take place within 4 hours. 10.  Let Surface Conditioner (Item 8, Table 1) set until touch dry before overcoating with mixed Fluid Elastomer (adhesive).  Test by lightly touching one knuckle down into Surface Conditioner.  Lift slowly.  If no conditioner is left on knuckle, it is dry.  If a second (outside) patch is to be applied, repeat steps 7 through 10 for outside of tank before going onto step 11. NOTE Both the Base and Solidifier components of the Fluid Elastomer must remain   sealed until just before application.  For best results do not apply the mixed   adhesive under the following conditions: = When the temperature is below 41 °F (5°C) = When the relative humidity is above 90% = During rain, snow, fog, or mist   = When there is moisture on the tank surface or moisture is likely to condense   on the tank before the adhesive cures. = When the working environment is likely to be contaminated by oil or grease from adjacent equipment or smoke from kerosene heaters or tobacco smoking. 11.  Empty entire contents of one can of the Fluid Elastomer Base (Item 5, Table 1). 12.  Shake one can of the Fluid Elastomer Solidifier (Item 5, Table 1).  Pour the contents over the Elastomer Base (Item 4, Table 1) in the mixing bowl (Item 18, Table 1). 13.  Using the mixing stirrer (Item 6, Table 1), immediately stir the Fluid Elastomer Base (Item 4, Table 1) and Solidifier (Item 5, Table 1).  Stir at least 2 minutes to form an adhesive. NOTE Use all of the mixed adhesive within the times shown in Table 2. 14.  Using one of the brushes (Item 8, Table 1) or the plastic applicator (Item 11, Table 1), apply one even coat of adhesive to the roughened surface of the tank and the prepared patch.  The coat of adhesive should be approximately 10 mil. (0.025 cm) thick. 15.  Let adhesive set until tacky (approximately 5 to 10 minutes).  Test by lightly touching one knuckle into adhesive. Lift slowly.  When knuckle lifts fabric briefly, and no adhesive is left on knuckle, it is tacky.