I went to do an estimate today and the HO says that they just bought the house, they want to paint the exterior all white, black trim, and for me to paint their galvanized metal roof red. The roof is currently blue.
I thought it was pretty obvious that this was not the best of ideas and expressed my concerns w/ the HO. However, she is willing to pay for it (I figured 5 days and it's a pretty simple A-frame type roof thats pretty small). I am sure in a week I could do it. I am pretty sure I estimated heavily due to the PITA factor and because I figured if I hit her high she'd second guess doing it. She is insistant though despite my concerns. So, anyone ever done this before? What type of primer, if any, should I use? Is there a specialty coating / industrial finish that you would recommend that would last longer than conventional paint? I told the HO our labor rate and explained that I have to do some research on the product we'll wind up using and charge the materials separately just in case they are extremely expensive. So, feel free to give me any clues as far as products go despite cost.
If the roof is currently painted blue and the paint is tight, why not use your preferred exterior paint. On previously painted metal we normally use PPG's Manor Hall. Am sure there are other products that would work as well.
SW has a product called All Purpose Enamel on the spray can isle and it is thick and hard after it dries, also sticks to everything. Covers well with deep colors.
I too use Timeless Exterior on all exteriors. However, this particular roof has a factory finish on it. I'm in Michigan and winters are extreme, summers are hot, and I am a bit worried about painting the roof a darker color than it currently is. The blue on it is kind of a baby blue. The red is nearly maroon. Let's say I talk her into a bit lighter shade though, you think Timeless is going last on a roof? I trust it in general but just have this feeling that it's going to be trouble on a roof. Maybe I'm wrong.
I too use Timeless Exterior on all exteriors. However, this particular roof has a factory finish on it. I'm in Michigan and winters are extreme, summers are hot, and I am a bit worried about painting the roof a darker color than it currently is. The blue on it is kind of a baby blue. The red is nearly maroon. Let's say I talk her into a bit lighter shade though, you think Timeless is going last on a roof? I trust it in general but just have this feeling that it's going to be trouble on a roof. Maybe I'm wrong.
Check with your PPG rep, but I was told that Manor Hall (not timeless, just plain manor hall) was originally developed for re-finishing metal siding. If you don't have a rep, pm me and I'll give you the email of the local guy here. He'd be more than willing to help you.
Not that I have anything bad to say about SW products, but I am still boycotting SW because of their ridiculous reps in our area. I ordered 15 gallons of resilience 2 weeks before a project and they didn't have it when they said they would. I gave them 5 more days - still no paint. Then the rep told me that they forgot to place the order. Sorry, I may not be National Coatings buying products in the six or seven figure range but 15 gallons should have been easy enough after almost three weeks.
Noxyde would probably be a great candidate for something like this. If you want to talk to pete about it for the recommendation, just PM me and I will give you his email.
Haven't looked at epoxies. Are you thinking a one or two part? I plan on spraying for the most uniform appearance. Just not sure what to put through the sprayer.
Around $35-38 depending on the base. You probably get a better deal because you probably buy more. I think the Timeless is a better all around paint except in this particular application. I think Timeless in both exterior and interior is about the best paint out there. (Yes, maybe better than Aura)
I would imagine on a roof you need something in the elastomeric range because it is going to heat up and expand and flex some. SW had several solutions for me when I needed to paint a roof. But my roof was also a porch so they couldn't figure that part out. ASE would probably not be a good choice. Nor is magenta as that is an organic based colorant which will fade (to blue). Red iron oxide reds will be much more color fast.
We use an epoxy primer and a urethane finish coat.
Be sure of what you are painting over. Is it a factory applied finish?
If it is Kynar or another very hard, long wearing baked urethane finish then you will certainly need to abrade it first, which is a good idea anyway. How do you know it is galvanized tin if it is now painted?
I would NEVER use house paint on a metal roof. Stay with the industrial line. We wet sandblast first. Apply SW catylyzed recoatable epoxy primer and finish coat with Corothane (SW) . Sometimes we finish off with a clear Corathane finish. Everything gets sprayed, a brush or roller never touches the metal. Very slick, glossy professional looking finish that sheds snow, resists sun fading and acid rain.
This is a 20 year system, but probably a bit too complicated for most house painters. Industrial Silicone enamel (single component) sprays nice and provides a real nice finish also. The key is surface prep, as with any type of painting. Clean, dry , dull and solid.
Today, we are spraying an older metal roof with an elastomeric (Kool Seal UNIFLEX) . Not slick and shiney, but a great easy to apply thick and flexible coating with some waterproofing attributes and a 10-15 year lifespan. Fairly easy job. Use a Graco 5000 or larger (thick).
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