Unless you pay to have a true faux finish applied painting them a single color will never look like aged copper.
How to paint gutters to look like copper.
One option is to buy a can of spray paint in copper and paint them yourself just be certain you buy a good quality paint and test the color on an inconspicuous spot as the color can oxidize somewhat and change.
Using copper dark brown and a tealspray paint as well as sand paper you can achieve a similar look to that of aged copper for a fraction of the cost.
Stir copper paint in the pail and apply by brush.
Paint them to blend in.
Installing copper rain gutters on your home might not be a practical option.
Almost any gutter no matter how cheap from home depot or lowes can be coated with copper paint.
If you have any questions let me know in the comments.
To save time use a palm sander instead of a sanding block.
However you can get the same look on.
Repeat until the surface has an even coverage of copper.
I love my copper gutters and instead of spray paint save your money and use the liquid version and you can have mock copper gutters just like those fancy 30 per foot ones.
Mix the copper surfacer well to ensure that the metal particles are evenly distributed.
I ve done exterior faux finish work that has held up over time but nothing exposed to the elements like gutters and down spouts.
If possible apply coating to gutters before installation.
Sand the gutters with a medium sanding block.
Let dry about an hour before applying a second coat.
Oct 29 2015 copper is a prized and very expensive building material.
Just wipe any loose dust or debris from the surface.
Also make sure the primer you are choosing is suitable for outdoor use.
Work the gutters over lightly with the sandpaper to remove rough patches and get rid of any remaining old paint.