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soll22
soll22

Posted: Wed Jun 29, 2011 12:44pm

Post Subject: blacking

the bottom is presently blacked with comastic. Is two pack the way to go what preparation would be required .Would it be worth the effort

Tony-B
Tony-B

Posted: Wed Jun 29, 2011 2:10pm

Post Subject: blacking

Comastic is a tar based blacking so for maximum compatibility anything you put over it should also be tar based but I think you can apply bitumen based coatings over well cured tar based ones. As far as two pack is concerned I must refer you to the manufacturers application and safety sheets for a definitive answer. As you make no attempt to specify what two pack product you have in mind I suspect you are asking for confirmation of what seems like a good idea at this time. I can not help with that because you do not specify a product. I THINK one of the International two pack products can be applied over sound existing coating but I know the usual recommendation is some form of grit/sand slurry blasting to totally clean the hull and then using a full two pot system. Although two pot coatings are normally tougher than single pot ones I suspect you will still end up with plenty of battle damage back to bare steel. Touching up with a single pack product is far easier than mixing and applying small quantities of two pack. (With some products there may be safety issues - especially if they are isocyanate formulations. I also notice that some two packs have weathered to a fairly light grey colour which I do not find attractive on a narrowboat but that is just a personal preference. Then there is the cost of the preparation and actual coating to consider. Tony Brooks

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