Etching the Bare Aluminum Post Sandblasting?

Corrosion, Paint, Through Hulls, etc.
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carl
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Joined: Sun Feb 08, 2015 5:58 pm

Etching the Bare Aluminum Post Sandblasting?

Post by carl »

BigM
Last edited by carl on Wed Jul 10, 2019 10:48 am, edited 2 times in total.
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Maestro
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Re: Etching the Bare Aluminum Post Sandblasting?

Post by Maestro »

Carl,

This is just my 2 cents...

Etching is a chemical process which removes the oxide layer from the surface of the aluminum, allowing paint to adhere to the metal.

One product for this is Sherwin Williams dual etch. Available through their automotive division and you probably have to order it in store. Other companies offer equivalent products.

The process is to spray the chemical on with a weed sprayer or Windex bottle and keep the surface wet for 5 minutes, spraying twice if necessary so the layer does not dry. Two people with sprayers would make this easier. Let surface sit 5 minutes, then rinse thoroughly with a hose. Now relax. Hull is etched. When it is dry, begin painting.
Maestro
1986 32' Sedan
Chrysler 360s
1.5:1 Gears, 16x16 props

1970 28' Express
Single Chrysler 440
1:1 Gear, 14x12 prop

Green Bay, WI
carl
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Posts: 355
Joined: Sun Feb 08, 2015 5:58 pm

Re: Etching the Bare Aluminum Post Sandblasting?

Post by carl »

BigM
Last edited by carl on Wed Jul 10, 2019 10:48 am, edited 2 times in total.
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Maestro
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Re: Etching the Bare Aluminum Post Sandblasting?

Post by Maestro »

Couldn't think of it before but just remembered - Keystone Automotive also carries an aluminum etch product that will work for this.
Maestro
1986 32' Sedan
Chrysler 360s
1.5:1 Gears, 16x16 props

1970 28' Express
Single Chrysler 440
1:1 Gear, 14x12 prop

Green Bay, WI
carl
Royal Aluminum Star
Posts: 355
Joined: Sun Feb 08, 2015 5:58 pm

Re: Etching the Bare Aluminum Post Sandblasting?

Post by carl »

BigM
Last edited by carl on Wed Jul 10, 2019 10:47 am, edited 1 time in total.
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Maestro
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Re: Etching the Bare Aluminum Post Sandblasting?

Post by Maestro »

Carl,

The picture is small and grainy so you can't tell - but I do have a navy blue boot stripe just like most BigM s do. It needs another touch-up but it is very easy to do. Taped it off with blue painter's tape and used a mini roller with Rustoleum marine topside paint.

Eliminating the boot stripe certainly wouldn't harm anything though.
Maestro
1986 32' Sedan
Chrysler 360s
1.5:1 Gears, 16x16 props

1970 28' Express
Single Chrysler 440
1:1 Gear, 14x12 prop

Green Bay, WI
TinLizzy
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Location: Lake Superior-Michigan's U.P.

Re: Etching the Bare Aluminum Post Sandblasting?

Post by TinLizzy »

There is a lot of Marinette's out there that got rid of the boot stripe when repainting. It would definitely cut down on taping.
Rodney
1975 28 Express-Twin 350 Chevy's, SOLD
1990 32 Express--Twin Mercruiser 454 with Bravo I outdrives
Portage Canal Waterway-Upper Peninsula,Lake Superior
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