Procedure Manual No. AT 101 Original Issue Date: September 19, 1989 Revision: 8 Date: June 1, 1997 PROCEDURE FOR APPLICATION OF PRIMER/FILLER/UV BARRIER PROCEDURE AT 101 PF – ALTERNATE 2 The Alternate 2 procedure for application of the primer/filler/UV barrier is essentially the same as the Alternate 1 or the original Air-Tech procedure. It differs only in the fact that the user no longer has to add any Flex Resin to the mixture to obtain the desired flexibility for use on the fabric surface. Air-Tech accomplishes this in the manufacturing process. After the fabric and tapes are installed move the assembly into the paint area for application of the flexible primer/filler/UV barrier. 1.
To ensure the primer attains the maximum wetting and adhesion the entire fabric covering must be cleaned with Air-Tech Fabric Wash (RF 4020 Rev. 3). Allow to dry 30 minutes before application of the primer. 2. Spray one coat of the primer and allow to stand overnight; the next day spray two coats of primer “wet on wet” waiting only until the surface is dry to the touch – normally 15-20 minutes. Do not spray if coat has been on an hour – one must again wait overnight. Do not spray excessively thick coats as this will retard cure severely. Apply wet coats to ensure good soakage but do not load up the primer. On thin fabrics the first coat can be brushed; keep it thin to avoid brush marks.
For clarification and better understanding the primer formulations used in this Alternate 2 Procedure are designated PFU 1020 for the standard and PFU 1030-F higher solids formulation. Follow mixing ratios for each formulation on the cans. Components used in each formulation are: PFU 1020 – Primer mixture components PFU 1030-F Primer mixture components PFU 1020 Primer Filler Base PFU 1030-F Primer Filler Base PCU 2010 Primer Catalyst PCU 2030-F Primer Catalyst Reducer Thinner RT 4070 Rev. 4 or 4085 Rev. 4 Reducer Thinner RT 4070 Rev. 4 or 4085 Rev. 4 a. Primer bases should be mixed in paint shaker prior to use. b. ALWAYS add the catalyst to the primer never vice versa. c.
Material should be allowed 5 minutes induction time after mixing. d. RT 4070 Rev. 4 thinner is used at temperatures below 75 F; RT 4085 Rev. 4 is used at temperatures above 75 F. The exact amount of thinner to add is a function of pressure, temperature, spray equipment, orifice sizes and painter technique. e. Air pressure must be set to obtain 35 psi at the gun. 3. If any areas require sanding let the primer cure for 12 hours after which it can be dry or wet sanded with 280-320 grit sandpaper. Do not sand over rib stitches, rivets, etc. but rather scuff these areas with a 3M Scotch brite Pad #7447. (3M Bldg. Svc. and Cleaning Products Div., St. Paul, MN 55144). 4.
Recoating can be done anytime after 12 hours up to one week without sanding or scuffing. After one week the surface must be sanded and/or scuffed for proper adhesion. Primed surfaces are now ready for topcoating with selected color. Follow manufacturer’s instructions during application. Notes: