Dorade vent cowl restoration - Page 2 - SailNet Community
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post #11 of 32 Old 06-28-2017
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Re: Dorade vent cowl restoration

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Originally Posted by oysterman23 View Post
JimsCal, that was to be my next solution having gotten the surfaces as clean snd smooth as possible Valspar makes paint for vinyl and plastics which has the right "coefficient of expansion" to remain uncracked. If yours had held up thats a good sign for this approach
k
The Rustoleum paint and preparation quoted above does work well for this type of application and exposure (at least 5 years on some of my cowls) Lacquer thinner can be used instead of acetone. It is/was mostly acetone anyway, but there are now different formulations that may not be as effective. PBBlaster is a penetrating oil for rusted fasteners. Not sure what it exactly contains (mostly naphtha and petroleum oil?) but surprised it would be useful here especially before painting.

In summary - get surface clean with soap and water, clean again with acetone, abrade slightly with sandpaper. Remove sanding residue, spray with Rustoleum special Plastic Paint.
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post #12 of 32 Old 06-28-2017
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Re: Dorade vent cowl restoration

Agree with the Rustoleum treatment. This is what I used https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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post #13 of 32 Old 07-31-2017 Thread Starter
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Re: Dorade vent cowl restoration

To follow-up. I ended up spray painting them with what was described as , 'for plastic' paint. The two cowls I have are different (previous owner probably lost one). The paint looks fine on both. However, on one it remains tacky. I am going to attach lanyards to keep them from going overboard. Batting .500 on this project.
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post #14 of 32 Old 08-01-2017
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Re: Dorade vent cowl restoration

If you find the 'for plastic' paint starts to crack because it is designed to BOND to plastic, but it is not flexible?

DupliColor makes "bumper paint" and "vinyl paint" that are designed to flex. Available in the larger auto stores. And IIRC Rustoleum and Krylon both make vinyl paints now. There's also one from one of the marine suppliers, designed to recoat MOB covers and fenders, probably only available in white.

Sometimes if paint is being reluctant to dry, you can mist it with "Japan drier" from the hardware store, or something from the auto boy supply, that will help pull off whatever solvents are still hiding in it. With care that it doesn't dissolve the base material itself.
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post #15 of 32 Old 08-01-2017
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Re: Dorade vent cowl restoration

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Then tried various things, but I think acetone worked best. .
^^This^^ is what I do. Dampen a rag with some acetone and wipe them clean as new. Use just enough acetone to dampen the rag, no more. Works great for vinyl coated lifelines as well - makes them white as new.
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post #16 of 32 Old 08-01-2017
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Re: Dorade vent cowl restoration

I was reading a post the other day on Facebook, a do it yourself sailing page and a guy had all these tips for using denture cleaner tablets but I guess it's too late you've already painted them.

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post #17 of 32 Old 08-01-2017
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Re: Dorade vent cowl restoration

My cowls and lifelines get sticky without painting! Not sure if it is because we are on flight path to nearby airport and exhaust fumes cause it.

The part about thorough cleaning and using acetone before painting IS important.

Hopefully your sticky paint will dry out in the sun
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post #18 of 32 Old 08-02-2017
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Re: Dorade vent cowl restoration

The stickiness is caused by the acetone.

Keth

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post #19 of 32 Old 08-02-2017 Thread Starter
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Re: Dorade vent cowl restoration

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Originally Posted by FreeAgent View Post
My cowls and lifelines get sticky without painting! Not sure if it is because we are on flight path to nearby airport and exhaust fumes cause it.

The part about thorough cleaning and using acetone before painting IS important.

Hopefully your sticky paint will dry out in the sun
I imagine it will always be sticky. That's OK. I will use it until it is all covered with bugs and dog hair, then replace.

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post #20 of 32 Old 08-02-2017
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Re: Dorade vent cowl restoration

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Originally Posted by Bleemus View Post
The stickiness is caused by the acetone.
Really? Funny that after 40 years of using acetone on lifelines, pvc cowls and rubrails, I haven't noticed that.
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