Hydrophobic coatings

I finally found a report on how super-hydrophobic materials affect bio-growth.

http://www.ornl.gov/adm/partnerships/tech/superhydrophobic/docs/ABCs_of_Superhydrophobic.pdf

The news is excellent. Go to page 27 in the report.

Results after 8 weeks of testing at the Battelle Florida Materials Research Facility:
– Quote by Dr. Henry Pate of Battelle: “In all the years that I have been testing material and
coatings, I have never seen anything that prevents biofouling this well”.
 
I can't tell if you're hinting that I'm making wild, shrill baseless accusations. I do do that, but here I'm just sort of wondering and suggesting caution, at least to my mind.

The circle of life really is a wonder. Those ants who cultivate and feed colonies of aphids that produce a fungus that is the ants only food is amazing. Tapeworms and trichinosis operate in the same way as the frog parasite, but I'm not too fond of them. Even though they too have Fathers and Mothers and Sisters and Brothers, I'm not about to invite them over for supper.

Chemicals and deformities bring to mind thalidomide. Agent Orange, DDT.

Recreational drugs like pot can surely bring up baseless accusations, but I do wonder about the chemicals that third world farmers spray on their product to keep bugs and molds from damaging it. DDT is banned in the USA, but not elsewhere. Arsenic makes a wonderful herbicide and insecticide, but I'll pass on smoking it.

I was the grounds keeper at the local school for awhile and Round-Up was one of the nasties I was required to use. I got to reading about it and apparently on the MSDS sheets required by the government, only the dangers of the active ingredients are dealt with. In the case of Round-Up, it uses a surfactant that is an 'inactive' part because it doesn't actually kill the plants, but only allows the poison to penetrate the plants easier. But the surfactant itself is deadly for small forms of animal life at the bottom of the food chain, and is accumulative, but since Round-Up is for killing plants, the fact that the inactive ingredients kill wildlife is irrelevant for MSDS purposes.

A grounds keeping book I had told of all the dangers of the various herbicides and pesticides and fungicides needed for healthy looking golf courses and sports fields, but then proceeded to show how much more deadly for humans plain old gasoline is. That made me think of all the times I've gotten a mouthful while siphoning it. The topic of this thread, the hydrophobic coating, may work wonders as a bottom coating. But these things have the potential of easily penetrating skin and then traveling around and collecting in very handy body parts like brains, livers, kidneys etc. I'm sure the ingredients are a proprietary, industrial secret, like Coca-Cola, but even if they aren't, there is no consensus or much study being done on their side effects.

DDT is a tricky case. From one aspect it is most certainly a nasty chemical that can accumulate in humans and the food chain. From another aspect, the ban on DDT is probably responsible for hundreds of thousands of deaths in Africa and elsewhere.
 
I finally found a report on how super-hydrophobic materials affect bio-growth.

http://www.ornl.gov/adm/partnerships/tech/superhydrophobic/docs/ABCs_of_Superhydrophobic.pdf

The news is excellent. Go to page 27 in the report.

Results after 8 weeks of testing at the Battelle Florida Materials Research Facility:
– Quote by Dr. Henry Pate of Battelle: “In all the years that I have been testing material and
coatings, I have never seen anything that prevents biofouling this well”.

Good find, reddwarf! Thanks.
 
So, that same company is located here in the town I live in. In addition, there is a long boat race called the Everglades Challenge, 7 days long, obviously thru the everglades here in Florida. My boat is a kayak based trimaran, 19 ft. I am looking for an edge anyway, so I am going over there tomorrow and get a quart of the base coat (30 min dry time) and a quart of the top coat (5 min dry time) and spray the bottom of my hull. The top coat is what gives the abrasion resistance, and I am guessing that only pulling the boat onto a beach or off is the only exposure to abrasion, as water is not all that abrasive. Hope it works.

Any update? Did you get a chance to test the coating?
 
Tom the rower - I just looked up the Everglades Challenge and I see it starts tomorrow.:eek: That is a very interesting and challenging race. Good luck, let us know how it goes.
 
Sorry to not respond right away, I was busy sailing in the contest. I finished my 60 miles at 11:30 pm. Great to have following winds ! As to the Ultra Ever Dry, I met with an engineer for the company, who said they had done controlled studies with a 35 ft powerboat before and after application and they had concluded that it actually slowed the boat down by about 1 knot. He said they are postulating that the nano particles act like hair and slow the boat down. Said I might be happier using rain x.
 
Rain X, interesting idea.

Is it okay on polyester gelcoat?

It's designed for silica glass, right?

Congratulations on finishing the race.
 
@red dwarf
i don't know if the question regarding barnacles has been answered yet...

i studied biology for some time and i know that these creatures produce some sort of biological glue to stick to their respective substrate.
this glue "cures" very much like blood and the proteins involved are similar or even the same, but comes as a fluid...
and even if the curing only takes fractions of a minute in an underwater environment - it should be repelled by this ever-dry stuff...

but consider that the coating must not have any, even the smallest microscopic leaks because the larvaes of barnacles are microscopic and they would definitely find this weak spots in the coating...

btw: epoxy is a quite similar substance than the barnacle glue - even if a lot weaker - but if epoxy is not adhering to a coated surface, then barnacles should also have it very difficult... ;)
 
Sorry to not respond right away, I was busy sailing in the contest. I finished my 60 miles at 11:30 pm. Great to have following winds ! As to the Ultra Ever Dry, I met with an engineer for the company, who said they had done controlled studies with a 35 ft powerboat before and after application and they had concluded that it actually slowed the boat down by about 1 knot. He said they are postulating that the nano particles act like hair and slow the boat down. Said I might be happier using rain x.


Thanks for the info. In my searching I have seen some theories that say not wetting the surface increases drag. Do you know how fast this 35 ft power boat was going? I don't care about losing 1 knot out of 40 knots (2.5%) but losing 1 knot out of 10 knots (10%) would not be so good.

My main interest is the possibility of long term resistance to bio-growth. I can live with a small loss in speed if it pays for itself in years of clean bottom. In fact if the loss in speed is just a few percent it will probably be the same loss as running a less effective bio resistant paint.
 
If you can get a small sample that you could adhere to you hull, let cure, then try to puncture it with a sharp stick that could tell you much about if it will resist wildlife growth.
 
My main interrogation is how this coatting will resist on sea water on the long term.
Secondly, Ultra Ever Dry is ultra ever expensive if you want to coat all your hull surface.

And as discuss previously, it is quite non eco-friendly
 
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