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tlbrosch 06-30-2012 01:41 PM

Painting metal siding
 
We have an eight thousand square foot barn that needs painted. We have cleaned with TSP product to remove the chalking and dirt. It has some light surface rust on the edges of the corrigated steel, my question is, is it best to put a primer on first or is the acrylic paint sufficient? The metal is 25 plus years old but we don't want the rust to get any worse, that is why we are painting now. We are trying to do the best with the least coats. Can we do primer and one coat or is it necessary to primer and two coats of acrylic paint. Can you recommend the best paint and primer for the job, don't want to do this again!

Gymschu 07-01-2012 05:37 PM

All your prep is spot on so far. For rusty areas simply "spot" prime those areas with a rusty metal primer. This is an oil based primer that converts the rust into a paintable surface. If you don't prime
those areas the rust will soon break through your new paint film leaving ugly rust streaks.

Canarywood1 07-01-2012 06:08 PM

Quote:

Originally Posted by tlbrosch (Post 954794)
We have an eight thousand square foot barn that needs painted. We have cleaned with TSP product to remove the chalking and dirt. It has some light surface rust on the edges of the corrigated steel, my question is, is it best to put a primer on first or is the acrylic paint sufficient? The metal is 25 plus years old but we don't want the rust to get any worse, that is why we are painting now. We are trying to do the best with the least coats. Can we do primer and one coat or is it necessary to primer and two coats of acrylic paint. Can you recommend the best paint and primer for the job, don't want to do this again!


This product gets very high marks from a lot of people that have used it, might be a little on the pricey side though.

http://www.calbarinc.com/

Cpcphil 07-03-2012 12:35 AM

if the surface is chalky this interferes with adhesion so an adhesion promoting waterbased primer should be used. also use a rust converting primer like gymshu recommended. Then 1 - 2 coats of a high quality DTM waterborne (Direct-to-metal) is recommended over the adhesion promoting primer. You might want to add some Emulsa-Bond to the adhesion promoting primer. This product is a paint conditioner that helps paints and primers stick to chalky surfaces...


good luck...

hayman 07-09-2012 02:26 AM

Last year I painted several barns with old red metal siding that was fading bad (red). We pressure washed all the buildings and used a brush also then rinsed. We just used water. Then I went over with an oil based primer then 2 top coats of white paint all from Cloverdale. I just went by what they recomended and had them check with the company to be sure. It covered fine and looks great so we'll see how long it lasts. I used an airless sprayer though and mine metal wasn't rusty yet.


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