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Galvanized gutters and downspouts have to be properly prepared so they don't rust. Both the downspouts and gutters need to be painted on outside, and the gutters on their insides as well. However, the gutter's trough cannot be painted with regular paint as it is not designed to be immersed in water.
Here is how I handled my gutters which were peeling badly on the outside and rusted on the inside. After researching how to prolong my gutters' life, I came up with the following steps.
1. I used my infrared paint remover to remove the old paint on the gutter's outside. The heated paint easily scraped off leaving the bare metal. I then primed the outside using two coats of the galvanized metal primer, KILZ Hammerite Rust Cap. After priming, I used two coats of Pratt & Lambert Exterior Acrylic Latex Eggshell, Figure A.
2. Next, I used a wire brush and scraper on the inside of the gutter to remove any loose paint and rust. I then washed the inside with a house wash cleaner, Figure B.
3. The clean and dry gutter was then primed with Acrymax HP-7000 primer (See below for product information), Figure C. The Preservation Products Acrymax line of coatings is designed for roofs, but is also excellent for the insides of gutters according to their technical representative.
4. After the primer dried, the bottom of a 2-3 foot section of the gutter was coated with Acrymax HP-5000, Figure D, and a piece of reinforcing cloth placed on top of this coating, Figure E. Immediately a second coating was applied to completely saturate the reinforced cloth and to coat the rest of the gutter's inside, Figure F.
5. A final coat was applied the next day.
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