Comments for I hear that seamark dries out and cracks within a few years. What can you tell me about that?

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Oct 21, 2017

by: Tammy

I'm not really surprised. The underside would sweat and any dirt mixed with the moisture would eventually mold.

Oct 18, 2017
Seamark and mold
by: Julie

I made a dodger for a sailboat from Seamark (linen colour) and the owner of the boat told me it got terribly moldy on the underside vinyl. The boat is in the humid tropics Central America.

Jun 26, 2017
Seamark
by: Tammy

You are correct. Seamark has been known to get brittle over time and crack. Even though, it is still a boat cover material that finds favor with OEM canvas manufacturers, because it retains the look and appearance of Sunbrella, but is 100% waterproof. You can build the bimini out of Seamark and come back and build the enclosure out of sunbrella and the fabric looks the same from the outside.
Another option is Sunbrella Supreme. Same thing, it is flocked on the underside and looks like sunbrella on the outside. It too is 100% waterproof. Some fabricators have been finding mildew growth on the underside and difficult to clean due to the flocking. So it's a trade off. If you want waterproof in a fabric that has the look and feel of Sunbrella, then Seamark or Sunbrella supreme it is.
Other options, are fabrics like BreakwaterX, Riviera, Stamoid.
These a pvc and have a much different appearance.

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Our boat was 10 years old when we purchased it and the canvas was stored all rolled up in the boat.   When we tried to put the canvas together the force required to zipper the canvas together was making the canvas split on the seams or causing the zippers to tear, so we had to leave parts of the canvas unattached and every time it rained we would get water in the boat.  With your zippers in place we could button up all of the canvas and make a very nice weather tight space which made our boating season very enjoyable.

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Tammy,
I purchased a used 27' Sundancer about a year ago.
I came with the Bimini, side curtains & windshield eisenglass panels along with a bimini to transom cover with eisenglass also.
I don't think the original owner ever put anything up except the bimini.
Nothing would fit, ever where it was short. 
If I cheated and put the windshield panels in the side curtains were never even close. If I did it the other way, sides first front panels were off. The canvas is hi quality material from a well known manufacturer.
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