In addition to graphite impregnated epoxy, I've heard that urethane paint has been used on hulls to reduce abrasion. Anybody have any experience with this? Norm SF Bay area *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
On Tue, 10 Nov 1998, Norm Strutin wrote: > In addition to graphite impregnated epoxy, I've heard that urethane > paint has been used on hulls to reduce abrasion. Anybody have any > experience with this? Some of the folks on the baidarka mailing list are using aliphatic urethane on their boats. I've seen a boat that had Gaco AU 7000 (I think that's what it is) on polyester fabric and the finish was flexible, clear, and glassy smooth. According to the builder the urethane is also very durable. There were no scratches visible on his boats, he normally runs them right up onto the beach. The aliphatic urethane is also highly toxic. They apply it using a fully hooded respirator with an external air supply. *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
Kirk has summed it up very well. I have coated over 20 boats with both UA-75 and now UA-7000. Gaco has discontinued UA-75 and replaced it with UA-7000. It is a very durable finish. Kirk is right I treat my boats very poorly in an effort to determine how tough they are. I have six boats laying around the yard that have been out doors in the shade, sun and under trees for up to four years and no sign of UV deterioration. The have been routinely dragged over rocks, mussles, sand and concrete without noticeable effect. That does not mean it is indestructable. You can put a knife blade through it but a sharpened stick is very difficult. There is a slight yellowing and a dulling of the surface with time. I have only used it over a precoat of ZAR exterior satin polyurethane to seal the fabric. UA-7000 does not seal the fabric very well all by itself. The precoat is necessary. I only put the UA-7000 below the gunwales. As Kirk said it is very toxic - repeat very toxic. I use full ventilation of the shop plus a fresh air supplied upper body breathing apparatus and air tight clothing and gloves. I stay in the shop only as long as it takes to coat 2 boats. Total time is about an hour. Then I get out and let the UA-7000 dry and the shop air out. It takes about a week to 10 days for the UA-7000 to cure. Up until it has cured it can be damaged by contact. After that it is like iron. It is not inexpensive, figure about $240 for 1 gal ea Part A and Part B. The other problem is that once opened its shelf life is about 2 weeks. Bill -----Original Message----- From: Kirk Olsen <kolsen_at_imagelan.com> To: Norm Strutin <nbsnbsn_at_ibm.net> Cc: paddlewise_at_lists.intelenet.net <paddlewise_at_lists.intelenet.net> Date: Wednesday, November 11, 1998 10:00 AM Subject: Re: [Paddlewise] urethane paint for bottoms? >On Tue, 10 Nov 1998, Norm Strutin wrote: > >> In addition to graphite impregnated epoxy, I've heard that urethane >> paint has been used on hulls to reduce abrasion. Anybody have any >> experience with this? > >Some of the folks on the baidarka mailing list are using aliphatic urethane >on their boats. I've seen a boat that had Gaco AU 7000 (I think that's what >it is) on polyester fabric and the finish was flexible, clear, and glassy >smooth. According to the builder the urethane is also very durable. There >were no scratches visible on his boats, he normally runs them right up >onto the beach. > >The aliphatic urethane is also highly toxic. They apply it using a fully >hooded respirator with an external air supply. >*************************************************************************** >PaddleWise Paddling Mailing List >Submissions: paddlewise_at_lists.intelenet.net >Subscriptions: paddlewise-request_at_lists.intelenet.net >Website: http://www.gasp-seakayak.net/paddlewise/ >*************************************************************************** > *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
Bill, Ah, so now I have the truth about 'AU-7000'. In your opinion, would coating the dacron with 'hypalon' (for desired color andpenetration of the fabric) then coat over (as a finish coat) of 'AU-7000' be of advantage? Would it work? Cheers, Philip ________________________________________________________________________ Bill Low wrote: > UA-7000 does not seal the fabric very well all by itself. The > precoat is necessary. I only put the UA-7000 below the gunwales. > > As Kirk said it is very toxic - repeat very toxic. *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
I've used urethane paint on a seguin which I built and on which I tried using an epoxy system other than West which apparently is more sensitive to moisture resulting in a cloudy finish. The urethane goes on alot easier than the epoxy paints but it seems to come off alot easier as well. That is my main complaint with it. With this feature in mind, I would guess that it doesn't help hull speed etc. too much. mark *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
This archive was generated by hypermail 2.4.0 : Thu Aug 21 2025 - 16:32:53 PDT