It can be difficult to paint galvanized steel because of its smooth finish.It is important to prepare the surface so that it can hold paint.If you want to clean the steel thoroughly, use a chemical degreaser.Once this is done, wipe down the exterior with white vinegar to lightly etch the surface and promote adhesion, and be sure to clean older steel with a high-grit sandpaper to remove any traces of white rust.Prime the steel with a multi-purpose outdoor latex primer, then finish with two even coats of quality exterior latex paint.
Step 1: A chemical degreaser is needed to clean the steel.
After spraying the surface with the solution, scrub it with a clean cloth.The zinc coating will not be affected by a powerful degreaser.Continue until you have cleaned the entire surface.Household products like chlorine bleach and mineral spirits can be used to prepare galvanized steel.A thorough cleaning is needed if you want to paint siding panels, roof flashing, or other materials that have been exposed to the elements.
Step 2: Allow the surface to dry.
Let the steel rest until all traces of the degreaser have dissipated.You won't have to worry about the solution interfering with the action of the vinegar, which you'll be using to rough up the smooth steel.It is possible to prepare and paint indoors or on a clear day.
Step 3: White rust, dust, and oil can be removed lightly with older galvanized steel.
It is possible to see a powdery film on parts of the surface when working with an item that has seen some wear.It is easy to buff out with a high-grit sandpaper and a little patience.Sand the steel using gentle circular motions.Afterwards, wipe the surface with a cloth and warm water to remove any leftover dust.
Step 4: The steel should be wiped down with mineral spirits.
Apply more mineral spirits when you get over the galvanized steel.It is important that the paint comes into contact with every part of the exterior.The slick zinc-coated finish will be etch by the acid in the vinegar, giving it a rougher texture that will allow paint to stick better.You may end up with peeling paint if you miss a spot.
Step 5: The vinegar should be left to act for 1-2 hours.
It will have plenty of time to eat at the galvanized surface.The better your paint will adhere, the more pronounced the etching effect will be.If the time for your project allows, you can let it work overnight.Wait until the surface is dry to the touch before moving on to painting.
Step 6: Use a latex-based primer.
The primer can be sprayed onto the steel surface.Aim for even coverage in small sections.When it comes time to paint, make sure there are no gaps or thin spots.Choose a latex primer that is designed for exterior use.If the steel is destined for rough industrial or outdoor conditions, it is a good idea to upgrade to a high- performance primer.They are resistant to scratching, chipping, and peeling and offer a semi-permanent hold.
Step 7: Allow the primer to dry.
Depending on the product used, this may take anywhere from 3-6 hours.If you want to know if the primer is ready to accept paint, run the pad of your finger over the surface.It needs to dry a little longer if it feels tacky.Applying paint to primer will make it hard to stick.
Step 8: Pick the right paint.
A standard latex paint will get the job done.Most home improvement centers and hardware stores have these.Don't use spray paint on galvanized steel.For the most reliable results, look for paints that bond to galvanized steel.The slick zinc finish on a galvanized steel surface can cause poor adhesion and peeling of the alkyd paints.
Step 9: The first coat of paint needs to be brushed on.
The paint should be spread across the surface.The tip of your brush can be used to paint grooves, creases, and textured areas.Before moving on, make sure there are no gaps or missed spots.It is possible to apply paint to broad surfaces with a roller.
Step 10: Allow the base coat to dry.
It will take 3-4 hours for the surface to accept another coat.Don't handle the fresh paint.It's possible to leave smudges or creases in the finished product.In warm, humid conditions, the drying times will be longer.
Step 11: Continue with a second coat.
Two coats is usually enough for most projects.The first time, apply the top coat the same way.Once the paint has dried, any imperfections may be visible, so take your time to make sure there are no inconsistencies.A box fan or air conditioning unit may help set up quicker.Once the top coat is dry, you can put the piece to use.
Step 12: As the paint cures, limit its exposure.
It can take a few weeks or a month for latex-based paints to fully harden.If possible, avoid subjecting the steel to stress and wear until then.It will be ready to take whatever you throw at it.The paint job on galvanized steel will be more resistant to extreme conditions when properly applied.