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So, 1 year old galvalume plus roof, oak trees over it made a mess of pollen and sap and dirt. I (homeowner) brooms the loose stuff off and hoses it down. But it is still filthy. Proceed to hose roof down again and clean it with strong mix 1/3 Krudd cutter / water, brush it down with a deck brush and then hose it off really well. It looks great- when on the roof. But on the ground, there are now dull, low sheen areas, kind of a haze mixed in with gloss areas, all glossy is how the entire roof looked when installed. I know I messed up with the cleaner being too strong (should pay more attention). I am thinking I stripped off the acrylic coat in some areas. Or at least made it soften and haze. Is the aged look of a bare galvalume, a “flat” sheen or glossy. Like I said, it looks great when looking perpendicular to the roof, when I am up on it, but spotty sheen changes when looking from the ground. Could I have messed up the substrate or is it most likely the acrylic and it will wear away and blend as a lower gloss sheen bare galvalume. If so, how long should it take for the remaining acrylic wear away and start to blend in. Thank you for your help
4/27/2021
My guess is that you did strip away some of the acrylic and started some oxidation of the bare metal. Normally the acrylic takes 5 - 7 years to wear away.
Isaiah Industries, Inc.
4/27/2021
So this should slowly even out? Is the final aged product of bare galvalume glossy or matte looking, is it darker or lighter than when first installed?
Thanks
4/27/2021
Because the now-exposed areas will always be accelerated in their weathring, I doubt this ever "evens out" but, yes, things do dull down after the acrylic is gone so the visual difference will likely lessen over a period of many years.
Isaiah Industries, Inc.
4/28/2021
Todd
Thanks for the information,
Follow up question(s), so what “color” and sheen does the Galvalume (plus) age to over time? From what I have read, the galvalume will become darker and more of a matte or flat finish VS the light gray/silver and gloss that it has when new. The reason I ask is because, the section where I “over cleaned” is almost white in color when the sun is coming from over my shoulder, but when the sun is overhead, there is NO visible difference, and when I am on the roof (looking down at it) there is NO visible difference, only when at a shallow viewing angle and the sun is behind me is the discoloration visible. So, I am thinking I softened and scuffed or put a chemical haze on the acrylic in some places, which should even out over time. OR if I removed the acrylic and “shined up” the galvalume, I am thinking it is going to dull out over time, and darken, assuming that it does normally “darken” some with age vs getting lighter in color with age. I just cannot find any examples of truly “aged” galvalume.
Also, I have read where the acrylic layer is super thin, like less than 0.001”, and more like 0.0001”, which is basically not measurable, does that sound right?
Thank you
Scott
6/2/2021
I believe it will dull down to more of a matte and gray look rather than silver. There are folks out there more familiar with this than I am though. Let's see if anyone else answers. As far as the film thickness of the clear coat, I'd expect it to be in the .0001" - .0002" range.
Isaiah Industries, Inc.
6/5/2021