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Removal of interior bitumastic coating on hull
Posted: Wed Jun 10, 2015 6:35 pm
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?
Re: Removal or interior bitumastic coating on hull
Posted: Wed Jun 10, 2015 8:01 pm
by ericinga
Why would you remove it?
Re: Removal or interior bitumastic coating on hull
Posted: Thu Jun 11, 2015 7:42 am
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
Re: Removal or interior bitumastic coating on hull
Posted: Thu Jun 11, 2015 10:56 am
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.
Re: Removal of interior bitumastic coating on hull
Posted: Sat Jun 13, 2015 2:24 pm
by Fastjeff
So that's what it's called. I've always called it the "Black Crap".
Jeff
Re: Removal of interior bitumastic coating on hull
Posted: Sat Jun 13, 2015 2:59 pm
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.
Re: Removal of interior bitumastic coating on hull
Posted: Sun Jun 14, 2015 12:35 am
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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Re: Removal of interior bitumastic coating on hull
Posted: Sun Jun 14, 2015 12:41 am
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.