Ok. I bought a house that was built in 1960. The paint job in the house is bad. It looks like a previous owner painted the entire house with a brush. The brush marks are in multiple layers. I'm starting in a spare bedroom to see what the best solution to this would be to smoothen th wall so I can repaint the room and move on to the rest of the house. I am currently sanding with 120 grit aluminum oxide sandpaper and a bosch 5" orbital sander and its taking a bit of time to sand it smooth (the paint is a latex). What would be my best options to tackle this huge project?
I've heard that an orbital sander is good for surface smoothing but that you need elbow grease to really dig through layers of paint. The sand paper you're using is what I was told to use on the "textured" walls and it sounds like you're having as much luck as I did. Have you considered skim coating over the top?
I was going to skim coat, I even considered mixing the primer and joint compound together. It would be far easier to do than sand down a real textured wall, but my walls are not as textured about 1/8 of the size of some textures. So I'm going to try a few layers of kilz to cover up my walls. Its more like orange peel just raised a little bit. I used to be a industrial painter so not used to residential painting. If this was industrial the paint would be different and easier to sand as it would be stronger than latex. If I was u I would skim coat the wall. Maybe try the primer and joint compound mixture. That was advice given to me b4 by a pro residential painter.
I know there's something called a flow extender additive that helps paint go on more smoothly. I know it works great on doors but I wonder if you could use it on something like this? Choosing a thicker paint is bound to help too if it's not that much of a texture.
It almost looks like they did a bad faux finishing job, where you take the plastic, spread it out and make the lines. I don't envy you...what a mess. I think you're on the right track, though. Let us know how it all works out.
WOW forgot I posted this here :) I ended up skimcoating the room. I posted a few before and after picks here: http://www.diychatroom.com/f4/bad-house-paint-job-brush-marks-everywhere-90968/index2/ and another here:http://www.diychatroom.com/f4/bad-house-paint-job-brush-marks-everywhere-90968/index3/