2-Part Perfection on Boom Info/Outcome
I want to use 2-part Perfection but read here that it will not adhere unless started from bare metal. Cannot understand why a good sanding followed by primer coats would not work.
Ed:
Below is an exchange that I had with interlux technical service before I painted my boom with Perfection. Might help. But also to report on the outcome about 20 months after the job:
- The epoxy Primecoat and Perfection have adhered well to the original mast paint job (believe the original factory finish) and to the sanded clean bare aluminum . There has been no peeling at all. The finish looks great. Application was by brush.
- However, in all spots where the aluminum had become pitted and oxidized deep enough that I couldn't get it back to shiny aluminum with the sandpaper after only several months the epoxy primecoat and Perfection began to "bubble" up. However, so far, these bubbled up areas haven't chipped off. Obviously I should have used some etching acid and/or special aluminum primer on these areas before applying the epoxy primecoat. However, I think one part primer is likely to dissolve and crinkle when the higher order solvent based epoxy is applied over.
- Be careful not to paint Perfection on your mast too late in the day. Because aluminum cools off so quickly at night, condensation will readily form on the just painted surface. If the 2-part Perfection reaction hasn't fully kicked-in, then in the morning you will find a blotchy shine result ... flat in some areas and glossy in others. Doesn't look very good. This happened to me on the first day when I finished just before dusk. I did the second coat earlier in the afternoon.
Also, when I first bought my boat, after painting my cabin top with Perfection, had found that I had just enough left for some mast work. This was a spur-of-the-moment decision and application. No real thought was given to it. The mast was up on the boat, so I just painted as far up as I could reach with a step ladder. I didn't prime the OEM finish at all. Just gave it a cursory sanding. Four years on, the Perfection is still well-adhered. However, same problem with the pitted areas as on the boom.
regards,
rardi
-----Original Message-----
From: Smida, Jay [mailto:Jay.Smida@akzonobel.com] On Behalf Of Interlux Technical Service
Sent: Friday, October 02, 2009 11:20 AM
To: richsuejardi@sbcglobal.net
Subject: RE: Epoxy PrimeKote & Aluminum
HI Richard,
I would make sure that everything is thoroughly sanded with 120-220 grit and all sanding residue has been removed. Since you have small bare areas, you should be fine to apply the Epoxy Primekote direct over both bare and existing finishes and still maintain sound adhesion. After you apply 1-2 coats of the Epoxy Primekote, you can then move onto your Perfection. If possible I would recommend prepping all surfaces and applying 1 coat of Epoxy Primekote the same day to ensure sound adhesion. Hope this helps to clarify any questions or concerns.
Regards,
Jay
From: jardines@mv [mailto:richsuejardi@sbcglobal.net]
Sent: Friday, October 02, 2009 12:57 PM
To: Interlux Technical Service
Subject: Epoxy PrimeKote & Aluminum
Hi:
I have some of your epoxy Primekote and Perfection left over from a cabin top painting project. (Came out well!)
My aluminum boom has lots of chips and some wearing through of its original white finish.
A small test patch with your Primekote reveals the finish does not soften/wrinkle with Primekote.
I am not looking for a new boom result. Just to make it look better.
My plan is simply to remove the boom hardware, sand and then paint (brush) with primer and then interlux.
Question is: Is epoxy Primekote ok to go directly over the small patches of bare aluminum that will result after the sanding? Or do I need also to use another pre-primer? Alternatively, can I just paint with the Perfection without a primer?
Thanks and regards,
Richard Jardine