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less stipple than thicker roller covers. Cut the covers into narrower widths to reach difficult areas or for long narrow surfaces like stringers. Complete all fairing and cloth application before beginning the final coating. Allow the temperature of porous surfaces to stabilize before coating. Otherwise, as the material warms up, air within the porous material may expand and pass from the material (outgassing) through the coating and leave bubbles in the cured coating. 1. Prepare the surface as necessary (Section 5.4.1). 2. Mix only as much resin/hardener as you can apply during the open time of the mixture. Pour the mixture into a roller pan as soon as it is mixed thoroughly. 3. Load the roller with a moderate amount of the epoxy mixture. Roll the excess out on the ramp part of the roller pan to get a uniform coating on the roller. 4. Roll lightly and randomly over an area approximately 2' × 2' to transfer the epoxy evenly over the area (Figure 9-23). 5. Astherollerdriesout,increasepressureenoughtospreadtheepoxyintoathin,evenfilm. Increase the coverage area, if necessary, to spread the film more thinly and evenly. The thinner the film, the easier it is to keep it even and avoid runs or sags in each coat. 6. Finishtheareawithlong,light,evenstrokestoreducerollermarks.Overlapthepreviously coated area to blend both areas together. 7. Coat as many of these small working areas as you can with each batch. If a batch begins to thicken before it can be applied, discard it and mix a fresh, smaller batch. Figure 5-23 Apply the epoxy in thin even coats using Figure 5-24 Tip off the fresh coat of epoxy with the a thin foam roller. grain, using a foam roller brush to remove bubbles and roller marks. 8. Dragafoamrollerbrushlightlyoverthefreshepoxyinlong,even,overlappingstrokesaf- ter each full batch is applied. Use enough pressure to smooth the stipple, but not enough to remove any of the coating (Figure 5-24). Alternate the direction in which each coat is tipped off, 1st coat vertical, 2nd coat horizontal, 3rd coat vertical, etc. A WEST SYSTEM 800 Roller Cover can be cut into segments to make a tipping bush. Re-coating Applysecondandsubsequentcoatsofepoxyfollowingthesameprocedures.Makesurethe previous coat has cured firmly enough to support the weight of the next coat. To avoid sanding between coats, apply additional coats before the previous coat has become com- pletely tack free and apply all of the coats in the same day. See Special preparation—Cured epoxy in Section 5.4.1. After the final coat has cured overnight, wash and sand it to prepare for the final finish. 5.5.1 Final surface preparation Proper finishing techniques will not only add beauty to your efforts, but will also protect your work from ultraviolet light which will break down the epoxy over time. The most common methods of finishing are painting or varnishing. These coating systems protect the Using WEST SYSTEM® Epoxy 46 5PDF Image | Vacuum Bagging Techniques 002150
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