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I have used both a Power Painter twice and a Pro type Sprayer once. In all cases I sprayed the paint on and then brushed over every inch. Its much faster than brush alone as you do not have to keep going back to the can to wet the brush. They Power Painter worked just as well as the pro model after overbrushing. The pro model was easier cause it took the whole gallon can of paint at once. The Power Painter you had to fill one quart at a time. I bought the Power Painter but borrowed the pro sprayer. The pro sprayers are expensive. You need to get a special nozzle for the Power Painter. I belive you use the biggest they sell for latex paint. You may also have to thin it but I suppose that depends on the exact paint and nozzle etc. I remember thinning it the first time I did it but did not have to the second time as Wagner had come out with the bigger nozzle byu then.
Anyway , even with the pro sprayer stay several inches away from the windows , etc or you will get overspray all over the place. I think I painted my whole house in 1 day with the sprayer and it used to take 4 days using brush alone. I have cedar shingles so you spray it all over , especially under the shingles , then I brush horizontal under the shingle lips and then 100% I brush vertically to finish it. You will have excess paint on the shingles so as the brush takes the excess off you just brush it on to an unsprayed area.
Last tip is to go back after 5 minutes or so to catch any drips, them if needed , again 5 minutes later. Sounds like a lot of work but you are covering the area almost 5 times faster so its definitely worth using the sprayer.
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