Originally Posted by Rhapsody-NS27
Thanks, I've been looking at stripping down my mast
. I've seen others who only sanded down the bad spots and even saw that recommended by others that if the paint
is still adhered well on the mast
, to leave it. But, I've been looking to strip it all down to bare metal.
While I've seen recommendations for Zinc Chromate primer, and I do have 3 rattle cans of it, I'm thinking to not use it. I'm looking at using Awlgrip products on this mast and they have a chromate-free primer, Wash Primer CF that I'm looking to use instead, after the alumiprep and alodine steps. The Wash Primer is still supposed to etch into the metal and provide a good base for the next layers of Primer/top coat.
Maybe the Wash Primer is something that could work for anyone not wanting to use zinc chromate.
Yes, my reasoning was where the old paint
was super well adhered leave it there, but since I removed half the paint from the mast anyway (corrosion, plus a section of single
pack recoat that would have fried up with the primer), I should have just kept going. I wasn't going for a showroom finish, but it ended up taking 2 days to touch up divots and reprime instead of just the extra half a day or so it would have taken to remove all the paint in the first place. Live and learn.
primer that I used stated in the data sheet to mechanically sand the aluminium and paint within 6 hours. I did this but also used an aluminium cleaner containing hydroflouric acid to etch the metal immediately after sanding
on the recommendation of the local paint supplier. I was happy enough with the final bare metal preparation, but I guess time will tell. I'm getting my boom done professionally by a friend of mine that runs an industrial sandblasting and painting business and he paints aluminium by sandblasting and prime immediately after with hi build epoxy
primer. The "prime" objective is, I think, to prevent excess formation of oxide between preparation and painting.