Three years ago I had a painting contractor repaint my steel roof that was 20 years old. The roof was pressured washed and let dry then sprayed with Delux Weatherguard paint, no primer used. Now the paint is pealing off in large pieces.
What would you recommend to fix this problem?
In my experience there is not a lot you can do. Your working with a smooth surface and with weathering, it will continue to peel. You might consider re-roofing, but that's down to you. Paint needs something to adhere to.
I wish you luck. Please don't spend alot on quick fixes, it will end up costing you more in the long run.
We are sorry to hear your metal roof is peeling off. The paint product that was used is not the right one. You need to use industrial paint product or this product http://www.envirocoatings.com/roofproducts.html
Dick, I highly recommend you to call the MPI inspector it is worth it they can tell you what is the best product for your metal roof and much more in details. Go straight to source MPI please.
You pretty much answered your own question, not using primer. Anything that I ever painted in construction whether it be drywall or wood, we always primed everything first with good primer and then used a very good paint.
My brother has a body shop on my farm in our big shop and I've never seen him paint a car unless it had a few coats of primer on before the finish paint. In the construction I own, we do over kill on everything.
My background is dairy farming and when you are raised on a farm there is no short cuts and you are taught either do the job right or don't do it at all. That was my fathers famous saying. Out in the country when every body knows everybody you have to do the job right or your reputation travels very fast of the work you are capable of. So have a good reputation of good work and your will have lots to do.
No primer is the key to your problem, so power wash it off again and when you prime before the finish paint it will be good. Don't thin primer or paint down with thinners, that will weaken the bonding of the mt'l to the steel. Put on full strength out of can. Some guys thin it down too much when spraying and this causes problems too.
Hopefully this helps.
Josh & Dale
The root cause is poor adhesion (which could be for several reasons) between the original paint and the metal, you will never stop this roof from peeling unless it is cleaned entirely down to bare metal before it is repainted. At that point, it would need a primer and a top coat.
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