Boats For Sale:
Cracking on bottom of Martinique |
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Keukaman 
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 Topic: Cracking on bottom of MartiniquePosted: May-03-2004 at 6:24am |
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I've noticed some fine cracking on the bottom of my 87 Martinique running from bow to stern. Has anyone else noticed this on their 80's Correct Craft? If so, what is the cause?
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ken@ckbd.com
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Joined: May-31-2004 Location: United States Status: Offline Points: 17 |
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Posted: May-31-2004 at 11:25pm |
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I've seen this on 60's era CC's. Usually ones that are operated in choppy or rough water and are subjected to alot of hard hull impacts. Where do you get your boat wet?
Other question; is your trailer a CC trailer designed for your boat? I know many people buy generic or non-specific trailers that don't offer the correct support for the type of hull and this can cause stress cracking after awhile. Typically, those cracks are only in the gelcoat and don't necessarily indicate a structural problem. Without seeing them, it's tough to speculate. Good luck. |
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68 Mustang
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Farkum
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Joined: June-10-2004 Location: United States Status: Offline Points: 41 |
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Posted: June-10-2004 at 10:54pm |
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Tomorrow I am picking up my new used 1979 Ski Nautique. It has really small stress cracks going up and down, mostly in the stern but there is one small one in the bow too. It was supposedly something that happened on a lot of older boats but it is nothing more than cosmetic. In order to fix it you have to sand, prime and paint the boat with an epoxy paint.
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kenny g
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Joined: December-13-2003 Location: United States Status: Offline Points: 318 |
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Posted: June-10-2004 at 11:39pm |
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speculation. the 68 barracuda had so many on the top,i can't count that high !thousands to repair all of em.not one stress crack in the hull.
i've been told it has to do with the amount of gelcoat sprayed into the mold when they were built.- sprayed the gelcoat a little heavy in some areas = future stress cracks. some boats cracked in areas and other boats built the same time did not. |
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kenny g
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66polyhead
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Joined: December-20-2003 Location: United States Status: Offline Points: 171 |
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Posted: June-11-2004 at 12:59am |
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OK guys, here goes: first, the hull form is sprayed in an upright mold. The gel coat is resin and color, no fiber. when it is sprayed too heavy, gravity takes hold. Sir Issac Newton found this out centuries ago. The resin goes to the bottom, the waterline, thicker resin takes longer to cure, right? The top mold is reversed, all boats are two piece, the top is sprayed up-side down. Gravity takes hold again, all the resin goes to the bottom of the mold, in this case the closed bow, the gunnels, ect. After time the slow cured gel coat resin cracks.
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kenny g
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Joined: December-13-2003 Location: United States Status: Offline Points: 318 |
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Posted: June-11-2004 at 11:36am |
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great explanation polyhead.UNIVERSITY LEVEL !
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kenny g
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