Ok here is the situation from A to Z. We are painting a flip house it has knock down texture and we are using a airless sprayer. I bought it at Harbor freight and it had really good reviews. I know harbor freight sucks. But any ways I have done tons of all rolling jobs and they always look great. But this spraying has me baffled. Im doing pretty much everything to spec and we are getting faint lines. The paint is valspar 2000 eggshell which is a beutiful paint and I have used it hundreds of times we are using a 515 tip and setting should be around 2000psi. Now while we are working we have a heater running and the house stays warm during the day at night there is no heat and gets pretty chilly. It appears its taking a while to cure. But I was just wondering if there are anything that would cause or prevent the lines.