The sand paper is less likely to clog. If your substrate is powder coated and is not chalking then grit will be enough to key the surface especially if you have scoured it first. And you would want the paint to really stick, right?
Just before you paint a window give it another clean wipe using your solvent wash, remember to use two different clean cloths. Painting- Use a three coat system with the first coat being a primer sealer light coat- use a single pac etch primer. The second coat being the first of the top coats, then the second top coat being the third coat. At this point, you have to make a couple of choices. First, what type of paint do you want to apply?
I recommend either oil based enamel or a two pac poly urethane. It is a coating added to aluminium by means of an electrochemical process. Anodising increases the durability and corrosion-resistance of aluminum, as it increases the thickness of the oxide layer on the surface of the metal. There are varying grades of anodising measured in microns, from 15um to 25um. The ideal external anodising level is the highest: 25um. This is a marine grade finish and will ensure the metal on your windows and doors is best protected against all the elements and provides the longest lifespan.
Anodising is a popular option for people who require the highest protection against the elements, particularly in coastal regions although high quality powder coating can offer very good protection for most residential applications.
The downsides a much more limited choice of colours and that the metal is prone to scratching as there is very little physical protection against the metal. Older aluminium windows and doors can be repainted later in life. Again, this is a specialist job. Using a regular brush to paint aluminium windows leaves unattractive brush strokes and blobs of paint on the surface.
This is because the paint runs freely over the existing finish but more importantly, it can get into rollers, locks, handles and other window hardware.
Clean being the tricky part with metal windows. Often, in high-UV environments, the factory finish on the window exteriors begins to oxidize and turn chalky. This is a major adhesion inhibitor if not removed. Remember, some of your windows open, so if you want your new color to be visible when the windows are open, then you need to open them up and prep the insides too — and the edges of the moving sash. After taping glass and rubbing with the steel wool, thoroughly wipe the surfaces with a non-soapy cleanser or prep solvent product from your Benjamin Moore or Sherwin Williams store.
The 2nd rule of painting aluminum window frames is thin coats of material. Top tip: Whether you use a spray paint or a brush, you should wait at least an hour between coats, so that proper layering can take place. Can aluminium windows be painted? Tips for Painting Aluminium Windows Aluminium windows must be prepared properly for paint to stick to them. Here are our top tips for painting aluminium windows to get you stated: Cleaning The first step in this process is cleaning.
Preparation Use masking tape to seal off and protect the areas around the window from paint, and use newspaper to cover the glass itself. Painting You will need an acrylic latex paint for aluminium windows.
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