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Painting Transducers

Old 03-24-2007, 09:14 AM
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Default Painting Transducers

It's that time of the year and the bottom will get a new coat of ablative paint. Last time I applied the special "transducer Paint" and when I pulled the boat, it was the only place with attached barnicles. The tansducer is the Raymarine Plastic unit. How do you folks treat your transducers to prevent fouling? Any suggestion or methods of paint or otherwise appreciated.
Thanks BigGrini
Old 03-24-2007, 09:22 AM
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KJS
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Default RE: Painting Transducers

I use the MDR paint and make sure I put at least two good coats on....



I have never had a problem with it but when my boat is in the water I use it quite often (which of course cuts down on growth).

Pettit has a spray on transducer paint as well. I have a can of it but have never used it.

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Old 03-24-2007, 09:55 AM
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Default RE: Painting Transducers

Thanks, the MDR was the product I used last year. I dont think I did two coats, perhaps thats the trick. Thanks for your input.
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Old 03-24-2007, 12:15 PM
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Default RE: Painting Transducers

When I lived up nortth I used the MDR paint and it was great. It did not work as well for me in the warmer waters of Virginia. Since I started using the Petit 1793 transducer and underwater metals paint I haven't had any barnacles at all. I even spray the inside of the thru hulls and it keeps out the growth. My boat stays in the water all year.



http://www.westmarine.com/webapp/wcs...allpartial/0/0
Old 03-24-2007, 12:33 PM
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Default RE: Painting Transducers

Mud Runner - 3/24/2007 12:15 PM



When I lived up nortth I used the MDR paint and it was great. It did not work as well for me in the warmer waters of Virginia. Since I started using the Petit 1793 transducer and underwater metals paint I haven't had any barnacles at all. I even spray the inside of the thru hulls and it keeps out the growth. My boat stays in the water all year.



http://www.westmarine.com/webapp/wcs...allpartial/0/0
Yes, that is the Pettit stuff I was talking about. I bought it but then read the label. The label says it is to be used on underwater metals but never once mentions plastics (like a transom mount ducer). I called the company and got routed to some guy. When I asked him if it could be used on plastic ducers he said "yeah yeah it can"....reminded me of the lyer guy on SNL....yeah yeah thats the ticket. Anyhow, to make a long story short, I haven't used it on my plastic ducer. I might in the future just makes me nervous that it is not labelled to be used as such. Does anyone have experience using it on a transom mount plastic transducer????? ;? ;? ;?
Old 03-24-2007, 01:13 PM
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Default Re: Painting Transducers

When I bottom painted my hull (for the first time) last year, I was told to avoid painting the hardened plastic (hockey puck looking) surface of a bronze thru-hull transducer. A year later it was a complete mess! However, it was easily restored to pristine condition via 2400 psi pressure washing and I'm planning on painting the entire surface of the transducer (bronze & plastic) with this same Pettit product this morning.

For what its worth, I'm told by a very experienced boat builder here that this particular product is specifically designed for all transducer surfaces (e.g., bronze, plastic, polyethylene, whatever), and that it is indeed the right way to go. In addition to the transducer, I plan on applying it to all other bronze thru-hulls (scuppers, etc.) that sit near or at the water line.
Old 03-24-2007, 02:29 PM
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Default Re: Painting Transducers

Reef Ranger,

As I said, I use it on metals and the transducer.Petit also makes a 1792 spray and both mfg's description specifically mention use for transducers. 1793 mentions for use in fresh and salt water. We sell alot of it in our marina and haven't had any complaints.

http://www.petitprod.com/catalog_browse.asp?ictNbr=120

http://www.petitprod.com/catalog_browse.asp?ictNbr=87
Old 03-24-2007, 08:40 PM
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Default Re: Painting Transducers

I just I nstalled a B260 on My boat and have bottom paint But the bottom Paint on My boat is Pettit Ablative. I Have taped off the face of the transducer and will use a water base bottom paint on the Face after wards.
This is from Airmar:
ANTIFOULING PAINT:
Surfaces exposed to salt water must be coated with antifouling paint. Use WATER-BASED antifouling paint only. Never use ketone-based paint since ketones can attack many plastics possibly damaging the transducer. Reapply antifouling paint every six months or at the beginning of each boating season.

Mark
Old 03-24-2007, 09:13 PM
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Default Re: Painting Transducers

offshore3144 - 3/24/2007 8:40 PM

I just I nstalled a B260 on My boat and have bottom paint But the bottom Paint on My boat is Pettit Ablative. I Have taped off the face of the transducer and will use a water base bottom paint on the Face after wards.
This is from Airmar:
ANTIFOULING PAINT:
Surfaces exposed to salt water must be coated with antifouling paint. Use WATER-BASED antifouling paint only. Never use ketone-based paint since ketones can attack many plastics possibly damaging the transducer. Reapply antifouling paint every six months or at the beginning of each boating season.

Mark
Exactly. That is why I was curious if anyone has used the pettit on their plastic transducer housings and their comments.
Old 03-25-2007, 11:06 PM
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Default RE: Painting Transducers

As a follow-up to my earlier post, I did indeed use this poduct (i.e., Pettit spray-on transducer paint) this past weekend for several underwater applications (thru-hull transducer and waterline scuppers), and here's my general view on it:

1. The product itself was excessively runny(i.e., it sprayed very little zinc, mostly solvent), and no amount of shaking beforehand seemed to help. It ran down the side of the treated area almost instantly, with very little application. So if you choose to use it, use it in very short bursts, and stay a good 18-20" away from the application surface.

2. This is not a 'paint' per se, but more like a 'dust'. When sprayed, the functional component of the aerosol (i.e., the elemental zinc) marginally adhered to the treated surface almost like a 'dust' or talcum powder, and after drying, much of it came right off with the slightest rubbing or scuffing (unlike paint). In fact, once the product dried on the inside walls of the one of my scuppers, simply running some water through it removed almost all of the product that had been applied??? And if it comes off this easy, what is its practical lifespan likely to be on a thru-hull transducer that has seawater streaming across it's surface while cruising?Needless to say, I'm skeptical.

Basically, its just 'weird' stuff. In fairness, multiple applications (N>5) did seem to help with the adherance issue (in other words, more of the product 'stuck' to the surface of the treated metal when applied several times and allowed to dry between coats), but for what its worth, the bonding to metal still wasn't very great (IMHO). In fact, on one occasion, the fifth or sixth coat actually "wrinkled" on me just like the old wrinkle finishes used to do, and yet none of the previous layers beneath it had wrinkled. So there was no chemical interferent or incompatability, etc. Maybe the exposed metal (scupper) had simply sat in the sun too long and gotten too hot before re-painting, I don't know?

Bottom line? This product is nothing miraculous in my view. I've already used it on my boat at this point so I'll leave it on andevaluate its effectiveness over time. But I probably wouldn't use it again. Certainly not on a thru-hull transducer with moving water scrubbing it almost daily. ;?

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