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Old 17-10-2021, 12:08   #1
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Epoxy Primekote over Brightside

I'm refinishing the mahogany cabin sides on my 50 Y.O. Ohlson 41. Over the years they've been painted and fiberglassed in some areas. About 3 years ago I coated them with Interlux Brightside. As has been my experience with Brightside, it begins to fail after a few years of sun exposure (some of the time in Mexico). I plan to overcoat with Perfection, and plan to prime with Epoxy Primekote. I notice that Primekote advises against use on one-part paints, but I still think it's better than using a one-part primer under LPU. I'm planning to go against Interlux advice, but has anybody got experience with this? The surfaces are well prepped and much of the Brightside sanded off, but underlying coats are also possibly one-part paints (everything very well adhered). I'm thinking that a two-part epoxy primer has the best chance of sealing and isolating the underlying materials prior to LPU. Any advice??

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Old 18-10-2021, 09:06   #2
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Re: Epoxy Primekote over Brightside

I don't think anyone wants to say "Yes, you can do it." There are thousands of combinations of paints, and definitively saying that any two are compatible is a crap shoot. Someone might say "Hell, no, don't even think about it," but saying yes, your then doing it, and having the whole thing blister the next day is not a responsibility I would want to take on. It "might work," it's "Likely to work," it "almost assuredly will work," yes, but "it will work," nope.
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Old 18-10-2021, 09:10   #3
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Re: Epoxy Primekote over Brightside

I have used Perfection on multiple boats with good success. I have also experienced a Brightside failure similar to what you describe.

My path in your situation would be to bust out the 80 grit to remove paint back to wood or epoxy, then epoxy prime coat then perfection. Under no circumstance would I paint over Brightside...I want it gone gone.

Possibly the underlying layers are good quality epoxy paint. You could prime coat a spot to see what results you get. I view this as a risk. But in general I don't mess around with "maybe" when investing the labor to get a good paint job.
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Old 18-10-2021, 09:48   #4
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Re: Epoxy Primekote over Brightside

You should contact Interlux.
I've gotten quick responses from them concerning their products, and it's possible to talk to a live human being who has answers.
Mixing/matching chemical coatings can be a crap-shoot without firm data from the manufacturer.
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Old 18-10-2021, 10:24   #5
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Re: Epoxy Primekote over Brightside

We have had excellent experience with International Toplac that has lasted well in the tropics (15 years plus). A few mods and repair patches were painted with Brightside and you are right it failed very quickly.

We started to repaint using Perfection and Primekote but have reverted to Toplac. Our previous experience of Toplac has given us confidence to use it again.

Perfection is not easy to use and the preparation and application of Primekote is much greater. Further we have wasted a huge amount of Perfection because the hardener goes off really really quickly, open the tin and you have to use it virtually immediately store it and it is often off before even opening the tin.

International DO NOT sell the hardener separately. Perfection is more difficult to roll and tip and is much more expensive.

If you really want to use a 2 pack poly then contact a car bodywork specialist. Their paint suppliers sell hardener separately, because they know it goes off.
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Old 18-10-2021, 10:50   #6
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Re: Epoxy Primekote over Brightside

It specifically says "Do not apply over one part paints". The solvent in it can soften the underlying paint. You can use a regular marine type epoxy as a tie coat. I have had very good luck with the following method (above the waterline). Heavily abrade the surface (36 grit). Wash the surface with dish soap (Dawn). Rinse well and wait until completely dry. Skim the entire surface with a mixture of epoxy resin, industrial talc, and a small amount of cabosil (just enough so it will not sag). Skim coat with this snot like mixture, (a set of drywall spackle blades works very well for this). Once hardened, scrub with Scotchbrite pad, Dawn and water and rinse very well. Sanding this epoxy/talc fairing compound is easy compared to other thickeners I have tried. Then you can use Primekote. I prefer Awlgrip 545. I have had problems with Primekote (the catalyzer has a use by date, and you must thin it at least 25%).
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