Removal of interior bitumastic coating on hull

Corrosion, Paint, Through Hulls, etc.
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boattown
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Joined: Sun Mar 15, 2015 2:53 pm

Removal of interior bitumastic coating on hull

Post by boattown »

Is there a good way to remove the foil-covered tar coating on the inside of the hull? I have tried pressure washing, strong soap / scrubbing, engine degreaser, and mechanical scraping. Any ideas?
Last edited by boattown on Thu Jun 11, 2015 10:57 am, edited 1 time in total.
ericinga
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Location: Cumming, GA

Re: Removal or interior bitumastic coating on hull

Post by ericinga »

Why would you remove it?
Eric Spies
1989 32 SDFB
Twin 318s
Lake Lanier, GA
Marinette Boat
ddependo
Royal Aluminum Star
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Re: Removal or interior bitumastic coating on hull

Post by ddependo »

My 2 cents. I know it is a sound damping material, but I don't like it. Smells bad, holds oil. I dumped two large jugs of Dawn dish washing soap in bilge , added water and drove it around for a while. Scraped it up with wide scraper knife. Then used wet dry vacuum to get it out. Didn't get it all but it looks better.
Wayne
1973 32 express fly bridge
Chattanooga
"Southern Lady"
boattown
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Re: Removal or interior bitumastic coating on hull

Post by boattown »

I am restoring the boat and while the engines are out, I want to clean the bilge. A lot of the coating has peeled up already so I wanted to epoxy coat the exposed metal.
Fastjeff
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Re: Removal of interior bitumastic coating on hull

Post by Fastjeff »

So that's what it's called. I've always called it the "Black Crap".

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington
ericinga
Aluminum Star
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Joined: Mon Jul 14, 2014 11:21 am
Location: Cumming, GA

Re: Removal of interior bitumastic coating on hull

Post by ericinga »

It's actually called bitumen. It's the cement used in asphalt. So, it is oil. When I pull a motor, I'll put something else under it since most of the coating has worn off.
Eric Spies
1989 32 SDFB
Twin 318s
Lake Lanier, GA
Marinette Boat
boattown
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Joined: Sun Mar 15, 2015 2:53 pm

Re: Removal of interior bitumastic coating on hull

Post by boattown »

I found that a heat gun and a scraper work well. I use paint thinner to clean up the residual bitumen. Next step is acid etch then epoxy prime.
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boattown
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Joined: Sun Mar 15, 2015 2:53 pm

Re: Removal of interior bitumastic coating on hull

Post by boattown »

Fastjeff wrote:So that's what it's called. I've always called it the "Black Crap".

Jeff
There is a guy online who has been restoring a 46 ft Chris Craft Roamer—all aluminum like the Marinette and similar construction. I got the term from his website, https://1969chriscraftroamer46.wordpress.com. This guy is an astonishing craftsman and a great documentarian. He has been restoring his boat since 2007 and has it beautifully documented. There is a lot of relevant information for Marinette owners.

BTW, fastjeff, I'm a big fan of yours. Thanks for all of your contributions to the Marinette community.
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