It lists cadmium and lead, interestingly. All sorts of chemical propellants and solvents too. I don't think the MSDS rules require disclosure of proprietary secrets, so if the biocidal property did not need to be addressed, for safety reasons, it may not be.MSD sheet for Pettit Barnacle barrier lists no copper compounds. Compare the MSD sheets to see if and how they differ.
Pettit Barnacle Barrier on top, Rustoleum Cold Galvanizing Compound below:MSD sheet for Pettit Barnacle barrier lists no copper compounds. Compare the MSD sheets to see if and how they differ.
Good point. I can find no list of solid ingredients on the SDS although the TDS indicates 55% solids by weight.That list for Barnacle Barrier lists only solvents. I think you missed something, or that list is incomplete, since it lists no solids at all.
You are missing most of the information in that post like the part of the MSDS sheet that says the Pettit also contains lead, zinc and cadmium which is further down the page
I'm not "missing" it. Those ingredients (if they exist) are simply not listed in the "Composition/Information on Ingredients" section of the Pettit product's SDS. The solids are listed in the corresponding section of the Rustolem spray's SDS however.You are missing most of the information in that post like the part of the MSDS sheet that says the Pettit also contains lead, zinc and cadmium which is further down the page
Lead won't kill the barnacles but it will make them dumber!the part of the MSDS sheet that says the Pettit also contains lead,
I have used both (for different applications) and they are definitely not the same. (Why would they be? They are totally different companies, and formulated for different applications.)
Rustoleum Cold Galvanizing compound dries to a much softer, less durable film. You can easily scratch it off with your fingernail. I've never tried it on a prop (or any marine application), but I am surprised it does not quickly ablate off the blades. I suppose it's possible that this soft material ablates at just the right rate to last a season while it prevents hard growth, but that would be a remarkable coincidence given the extremely strong shear experienced by a prop blade.
Pettit Barnacle Barrier is a much harder, more durable paint. I can tell you from experience that it is almost impossible to remove once fully cured.
You know what they say: "If you read it on the Internet, it must be true....NOT!"
I suspect that there are people out there who see the same zinc level and assume it's the same stuff. There's a lot more to paint than just the amount of zinc. There are multiple resin chemistries, and use of fillers that give various mechanical properties which are critically important to the paint's durability over time. A healthy dose of skepticism is required of any claimed internet experts - including me!
Both contain 90 percent zinc. Ever see a barnacle stick to zinc??? I have used rustolium here in New York /Long Island for years and never had a barnacle stick to my shafts, strainers, props or thru hulls. It's the same crap. Now, the same cannot be said for my interlux micron extra!Wow, one of the few certainties in life is the impossibility of killing a good rumor.
I have seen barnacles attached to many Barnacle Buster/Cold Galvanizing Spray coated props.Both contain 90 percent zinc. Ever see a barnacle stick to zinc???
Where is the boat in the water? Location matters too: water temps, bio density, etc.I've been using it since 2011
Long Island. I am a plank member in the silverton forums and members all around the country are getting the same resultsWhere is the boat in the water? Location matters too: water temps, bio density, etc.
I get nothing, I'm on the south shore. And I use my boat. If you don't move your boat like a lot of people , we'll only an act of God will stop barnaclesI have used Pettit BB for years. It helps, but saying you never get barnacles at all is just not correct. I am also on Long Island. Boat is on a mooring. Prop and shaft typically will need some scraping by mid season to get the barnacles off. As had been said, location is important. Big difference between a mooring and in a slip.