I recently acquired a 1978 glastron sportster and need to rework the upholstery. The plywood backing is water damaged but not rotten but was going to replace while I had the parts out. I cant get marine grade plywood in my area so was wondering if treated would suffice or go with exterior grade and use a sealer. Opinions would be appreciated.
It depends on how long you wish it to last.
I would use the best there is, Marine Grade, if I wanted it to last.
If I am going to keep the boat a year and sell, go cheep, then when it fails it will be someone elses problem.
Here are some important questions and information pertaining to stainless steel:
What is the most common grade of stainless steel? — Though stainless steel is an extremely popular alloy, the number one most popular grade is stainless steel 304.
Are there other classes of steel? — Though stainless steel is the most popular, there are other classes, including crucible steel, carbon steel, alloy steel, maraging steel, weathering steel, tool steel, and spring steel.
Where is the majority of stainless steel produced? — Today, most stainless steel comes from China. In fact, stainless steel production in China accounts for more than 50% of global annual stainless steel production.
Monel
Here are some important questions and information pertaining to Monel:
What is Monel? — Monel is commonly used in applications with highly corrosive conditions. Small additions of aluminum and titanium form an alloy (K-500) with the same corrosion resistance. However, with much greater strength due to gamma prime formation during aging, Monel is typically much more expensive than stainless steel.
What is Monel made of? — Monel is a group of nickel alloys, primarily composed of nickel and copper, as well as small amounts of iron, carbon, silicon, and manganese.
When was Monel discovered? — Monel was created by the International Nickel Company in 1901.
Pressure treated plywood will outlast all of us, but there again, you need stainless staples or tacks. Marine plywood will rot in a few years unless glassed or sealed.
I think I'll just go with half inch plywood and stainless Staples for the upholstery backing the boat will be under a shelter when not in use so I don't have to worry about water getting to the deck that often. I'm really surprised due to the age of the boat that the floor seems seems to be in decent shape. there are no soft spots that I have found so far except for rot under the battery compartment. Which will be replaced
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