Marine Plywood?
"dadiOH" Consider the number of cars that have had dings filled with Bondo. Bondo is polyester resin and talc. Have you seen many chunks of Bondo along the roadside? Alas, yes. |
Marine Plywood?
"Toller" I have epoxy (and linseed oil and polyurethane varnish) but hesitate to use it since it is not UV stable. Almost nothing is UV stable, including paint, wood, epoxy, varnish, polyurethane, and wood. However, sealing plywood edges with epoxy, lightweight fiberglass (with the appropriate weight fabric and a curve that it can take), covered with primer and paint, is as good as you can plan for. As long as you maintain the paint for appearance, it will probably serve to preserve the epoxy & fiberglass. I figure that a decent job of it, aside from direct scrapes and dings, should be good for 5-10 years of regular use. If you're looking at the leading edge of a kick-up rudder that meets the ground routinely, you'll need more than one layer of glass, and regular touch-ups of paint. |
Marine Plywood?
"dadiOH"
Consider the number of cars that have had dings filled with Bondo. Bondo is polyester resin and talc. Have you seen many chunks of Bondo along the roadside? More than I can remember. You can spot a "Bondo Job" from a 100 ft in a snow storm. Lew |
Marine Plywood?
On Sep 11, 12:00 am, "Toller" wrote:
My Potter 15 rudder is made of 4 pieces. The top is a solid core about 10"x15", with two pieces ofplywoodscrewed to it on either side measuring 10"x30". The solid blade mounts between theplywood, below the solid top. One side of theplywoodis falling apart, and the other side isn't doing much better. I went to the lumber yard today to buy someplywoodto replace the bad parts. They have Marine Fir and Marine Okoume. They told me that neither will be durable; they have to be covered with fiberglass. If that is true, it certainly explains why the original is falling apart, as it is not covered in fiberglass. I bought a piece of fir, which I will cover with spar varnish just to get me through the end of the year. This winter I will rebuild the whole thing. (neither the top core nor the rudder blade are looking real good either). What is the story onplywood? Is nothing suitable for marine use without being fiberglassed? Would solid wood (3/8") substitute? Any advice on how I go about doing this so it is durable would be appreciated. You can buy a marine plywood as the following: Species: hardwood(red hardwood like Okoume is better) or birch Glue:best Phenolic glue The core should be void free . Mason Pan http://www.plywood.cc/ |
Marine Plywood?
Okume is not hardwood it is softwood, as such it is often covered in
fiberglass. In France we use Moabi plywood with f/g but I'm not sure if its available in your area. Mason Pan wrote: On Sep 11, 12:00 am, "Toller" wrote: My Potter 15 rudder is made of 4 pieces. The top is a solid core about 10"x15", with two pieces ofplywoodscrewed to it on either side measuring 10"x30". The solid blade mounts between theplywood, below the solid top. One side of theplywoodis falling apart, and the other side isn't doing much better. I went to the lumber yard today to buy someplywoodto replace the bad parts. They have Marine Fir and Marine Okoume. They told me that neither will be durable; they have to be covered with fiberglass. If that is true, it certainly explains why the original is falling apart, as it is not covered in fiberglass. I bought a piece of fir, which I will cover with spar varnish just to get me through the end of the year. This winter I will rebuild the whole thing. (neither the top core nor the rudder blade are looking real good either). What is the story onplywood? Is nothing suitable for marine use without being fiberglassed? Would solid wood (3/8") substitute? Any advice on how I go about doing this so it is durable would be appreciated. You can buy a marine plywood as the following: Species: hardwood(red hardwood like Okoume is better) or birch Glue:best Phenolic glue The core should be void free . Mason Pan http://www.plywood.cc/ |
Marine Plywood?
Go with rotary cut Sapele. It is reasonably rot resistant, much more so
than Occume or Gaboon. It is about as strong as Fir but without the checking issues. It costs about 2 times what Occume or Fir costs. If you plan to keep the boat...go with the best materials and you won't have to do this job again. |
Marine Plywood?
Okoume is hardwood .
Hardwood means "wood from broad-leaved or deciduous species of trees (not necessarily hard or dense)" . Mason Pan http://www.plywood.cc/ On Sep 23, 3:57 am, Phil wrote: Okume is not hardwood it is softwood, as such it is often covered in fiberglass. In France we use Moabi plywood with f/g but I'm not sure if its available in your area. Mason Pan wrote: On Sep 11, 12:00 am, "Toller" wrote: My Potter 15 rudder is made of 4 pieces. The top is a solid core about 10"x15", with two pieces ofplywoodscrewed to it on either side measuring 10"x30". The solid blade mounts between theplywood, below the solid top. One side of theplywoodis falling apart, and the other side isn't doing much better. I went to the lumber yard today to buy someplywoodto replace the bad parts. They have Marine Fir and Marine Okoume. They told me that neither will be durable; they have to be covered with fiberglass. If that is true, it certainly explains why the original is falling apart, as it is not covered in fiberglass. I bought a piece of fir, which I will cover with spar varnish just to get me through the end of the year. This winter I will rebuild the whole thing. (neither the top core nor the rudder blade are looking real good either). What is the story onplywood? Is nothing suitable for marine use without being fiberglassed? Would solid wood (3/8") substitute? Any advice on how I go about doing this so it is durable would be appreciated. You can buy a marine plywood as the following: Species: hardwood(red hardwood like Okoume is better) or birch Glue:best Phenolic glue The core should be void free . Mason Pan http://www.plywood.cc/ |
Marine Plywood?
On Thu, 11 Oct 2007 01:41:03 -0700, Mason Pan
wrote: Okoume is hardwood . Hardwood means "wood from broad-leaved or deciduous species of trees (not necessarily hard or dense)" . Balsa is a hardwood. Yellow pine is evergreen and the wood is quite hard for a pine, of interest if you make tables or floors, and not meaning jack **** for framing. The confusion begins with the simple fact that among kinds of lumber pretty much all the hardwoods for sale are in fact harder than the softwoods for sale. All wood is not commercial lumber. There is balsa and there is ironwood, which doesn't float in water.You don't finder either at a lumber yard. Casady |
Marine Plywood?
On Sep 10, 10:00 am, "Toller" wrote:
What is the story on plywood? Is nothing suitable for marine use without being fiberglassed? As others have pointed out, you have to be careful fiberglassing plywood. I build driftboats with marine fir and/or mahogany, covered with glass. But only for sides and seats. For the bottoms I use a plastic honeycomb core from Nida Core or Plascore. Plywood that stays in contact with the water will eventually get nicked or dinged. Water will migrate into the plywood and then you're toast--well, soggy french toast maybe. At that point you have to grind off the fiberglass and move to Arizona for a month or two. You could make your rudder with 3/4" Plascore, stiffened up with glass on both sides, with puttied and taped edges. It's a quick and easy way to make lightweight, stiff, water proof parts. |
Marine Plywood?
salmobytes wrote:
Plywood that stays in contact with the water will eventually get nicked or dinged. Water will migrate into the plywood and then you're toast--well, soggy french toast maybe. At that point you have to grind off the fiberglass and move to Arizona for a month or two. This must really sound weird to the thousands of plywood sailboats owners. There are plenty of 30 to 40 years old boats still sailing. Well painted marine plywood is very durable. |
All times are GMT +1. The time now is 09:22 PM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 BoatBanter.com