Slab,

A 60-65 degree day with a slight breeze is my favorite temp to paint in. Good slow dry. You never want to paint on bare wood (T1-11 or anything else), unless your are priming. Have them tint your primer, it helps. They may gripe, but they'll do it. Prime is part of prep.

Early morning clear mornings can have dew, late evening can develop dew. Dew is not good for painting, especially on previously painted surfaces. Virgin Hardi is a bit more forgiving, so is flat paint. Let the dew dry if the previous coat is satin or higher sheen. Back roll everything, except for Hardi. Hardie is spray and don't touch. Medium first coat, light second coat. Lots of Hardi tricks if you use it. I shot my 4,300 SF house and garage with 2 coats by myself in a day, but it was properly prepped.

Temp and humidity matter. I try not to paint in the heat of the day when it is over 80 degrees. Good temp range is 50-75. Humidity 45-65%. Sometimes you just have to paint when you have a window of clear weather.

Project at hand:
Back deck prepped, TSP and bleach applied with a garden sprayer, let soak, scrub & a light pressure wash @ 1500 PSI. Light duty pressure washers don't destroy wood, or etch your concrete.




Front porch prepped, same as back. It is covered, so it wasn't as weather beaten.



Color chosen was Timberline. It is a perfect match to the Sunwood (not available at Home Depot ). Back deck benches and uprights are done. Tomorrow I work on the ballisters, railings and other verticle pieces on the front deck. Finished at 905pm, so I didn't get pics of the finished back deck benches and uprights.