I’ve been doing a bit of research around on paint for my boat, including anti-fouling paint for the bottom.
Opinions, as in everything, abound. Even the question of whether you need anti-fouling paint for a trailer boat is much in doubt, by some. It seems to boil down to how long you’re in the water. Of course where you boat has a good bit of effect also, since the various scummy critters vary depending on fresh/salt water, water temperature, lighting conditions, and who knows what else.
I wanted to list a few resources I’ve ran across. Don’t know that I’ve made final decisions yet, although I have a few leanings.
Pettit Paints – currently they resell the Hydrocoat antifouling paint. For a multi-season ablative paint, this seems to be my choice. Multi-season means it can dry out on a trailer and still work when you go back in the water. Ablative means it wears away and "disappears" as it’s used up. If there is paint left, its working. This keeps the scraping and sanding down when it’s time to renew it. There are certainly competitors to this product, but many people have seemed to recommend it.
WoodenBoat Forum discussion – there are lots more on the various boards, but there was a lot of good discussion in this thread, in my opinion. As I mentioned, like many boat related things, everybody has an opinion 🙂
California Paints Pool Paint – I toss this in just because it came up in some of the online discussion boards as a "wonder how that would work" item. Its apparently designed for underwater use…
Was fixing to go out this afternoon and have several hours on the boat… then the monsoon hit for a while. We need the rain badly, but…
Anyway, it calmed down after a while and Dane and I went out and did some skimming/smoothing on the bow where it’s pretty rough and pocked. The various boards didn’t lay down as nicely as you could want, so there were still some gaps and unevenness that I tried to smooth out.
Then we did a bit more filleting and taping on some of the sheer clamps on the inside where I wanted to reinforce things. That seemed to go well and I ran out of steam in the hot, humid air about the time I ran out of epoxy.
More should arrive on Tuesday (large batch for the sheathing efforts). I have things scheduled for us to sheath the hull next Friday (I’m off for the holiday). Hopefully the weather will cooperate.
Courtney & Tara are building a Willow Bay "Shilling" – a 17 foot (length-on-deck) wooden day-sailer. This blog will document construction details and progress, from ordering study plans to launch day and beyond.
The Shilling is a Phil Swift designed small day-sailer. These guys are doing a nice job documenting their build. Lots of things to learn here.
To go with that roll of cloth, I know I’m going to need some more epoxy to wet it out with. Did a fair amount of research over the last couple of days trying to get some idea of about how much epoxy this was going to take.
The designer wasn’t sure on his use (it’s been a while), but he and others commented that it takes "a lot" of epoxy to wet out xynole. Found a few approximate figures, but still wasn’t comfortable estimating.
Larry at Raka, Inc. came through again. A quick email (had meant to ask when I ordered and forgot it) and promptly replied.
The xynole will take 1 mixed gal. of epoxy for every 100 sq. feet on a hard surface. If putting on over plywood, you have to allow the first coat of the fir plywood at 1 gal to 150 sq. feet in addition to what the xynole will take.
Yet another example of good customer service.
I ordered 6+ gallons (5 gallons resin and 1.6 gallons of hardner) from U.S. Composites, along with some talc for mixing with epoxy for fairing, and some stir sticks. That should show up in a few days and then we’ll be aiming to put this stuff on the hull.
I expect to have it ready for it all over this weekend.
Lastly spent a while today researching paint and anti-fouling. Don’t know for sure which way I’m going with this… more later.
In actuality this is the roll of Xynole from Raka, Inc. I’m really impressed now. I ordered this stuff on Monday and it’s here two days later. And it’s not like I paid for next day shipping or anything.
Packing was quite good. Apparently some people ship Xynole folded, which then requires you to iron it to get it flat. Raka shipped mine rolled on a tube, then wrapped in plastic, then the entire thing wrapped in fairly heavy cardboard. The cardboard had split in one spot at one end, but the other packing all held and there was no problems.
Despite lots of references to this stuff (xynole polyester cloth), I had never actually seen it or a picture of it before this arrived. It’s very much like “scrim” or muslin cheesecloth type material. Here’s a closeup picture of it if that helps anybody know what they are getting.
Got an email from Kay referring to her and her husband Doug’s web site where they are chronicling the home build of their personal submarine. Not something that everybody (even boatbuilders) will choose to bite off.
They also have details on a ROV (underwater Remote Operated Vehicle) that they provide plans for building your own.
Their next project is going to be a home build Origami (steel) sail boat.
Lot’s of details and things they are willing to share and help teach you via their postings. Really neat site that I can tell I’m going to enjoy.
A man that has made a life of studying various natural developments noticed years ago that certain whales have odd "bumps" on the leading edge of their fins. He thought that was really odd.
A long story of chopped up whale fins and other oddities led him to discover that these bumps radically change the air/water flow over fins/blades. There is a company using this knowledge to create a fan that moves the same air with a lot less power.
Makes me wonder if there wouldn’t be a good application to boat propellers.