I want to use this to repaint my wood railings on my porch. White paint. Is there a recommended kind of outdoor paint for use with this sprayer.

When you're going to spray paint, it doesn't make sense to spend extra money on "thicker" paint, because you know it will have to be thinned. Any regular, quality brand, latex wall paint should work well. There are a few things you can do to paint/stain to ensure it sprays well. 1 - Stir the paint/stain with a mixer in a drill until its creamy smooth, about 1 min per gallon 2 - Strain the paint/stain before it goes into the sprayer 3 - Add a flow agent, like Floetrol or Paint Easy (this is not a thinner) for latex paint – Penetrol for oil based 4 - Or you can thin, even as little as 5% can make a big difference, water for water based materials and mineral spirit for oil based material. Also, you can thin up to 20% without harm to the material being sprayed. With the Flexio 2000, thinning wall paint 5-10% is sufficient. For more application guidance call us at 1-800-328-8251.