Andy,

I think you may be confusing propspeed with the Pettit 1792.  As I
understand it Propspeed results in an ultra slippery surface which simply
prevents biofouling from having anything to attach to.  A small kit can run
$300.  The Pettit product is according to the label ~55% zinc while
liquid.  But once the solvents evaporate it leaves a very high
concentration of zinc.  A single spray can is ~$30.  The Thiox product I
mentioned earlier is actually Velox and actually releases a biocide.  As
such it is quite likely the most hazardous and unfriendly to the
environment.  It costs ~$100.

Of the three propspeed is just too expensive for me to try.  Between velox
and Pettit, neither seemed particularly better than the other.  And if you
can find cold galvanizing paint for less than $30 then your idea is
probably the best option.

https://propspeed.com/
"Propspeed is a foul release coating, not an anti-foul, so it doesn’t harm
marine life. The top coat on the Propspeed system is an ultra-slick surface
that marine growth can’t grip. Propspeed’s effectiveness does depend on
movement of your boat - the more you use it, the better Propspeed performs.
Propspeed sets itself apart from the competition with the exceptionally
strong chemical and physical bond between the metal substrate, the primer
and the top coat - this ensures that the Propspeed coating actually stays
on your running gear."

https://pettitpaint.com/products/underwater-metal-protection/prop-coat-barnacle-barrier/prop-coat-barnacle-barrier/

Velox
https://www.antifoulingpaint.net/


Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD




On Tue, Aug 11, 2020, 06:03 Andrew Burton via CnC-List <
cnc-list@cnc-list.com> wrote:

> Propspeed is mostly zinc. The thinking around here is that plain zinc
> paint will do the job as well for a fraction of the price. I just painted
> my MaxProp with cold galvanizing paint again. It seems to work as well as
> anything else I've tried.
> Andy
>
> Andrew Burton
> 26 Beacon Hill
> Newport, RI
> USA 02840
> http://sites.google.com/site/andrewburtonyachtservices/
>
> phone  +401 965 5260
>
>
> On Mon, Aug 10, 2020 at 10:44 PM Rick Brass via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> FWIW, my Flexofold prop is painted with a product used by most of the
>> commercial fishermen in Eastern NC called Propspeed.
>>
>>
>>
>> I don’t know anything about Pettit 1792. But past efforts to use bottom
>> paint on a prop have not been very useful. The bottom paint tends to sluff
>> off pretty quickly, probably due to cavitation.
>>
>>
>>
>>
>>
>> Rick Brass
>>
>> Washington, NC
>>
>>
>>
>>
>>
>> *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of *Bruce
>> Whitmore via CnC-List
>> *Sent:* Monday, August 10, 2020 8:29 PM
>> *To:* C&C List <cnc-list@cnc-list.com>
>> *Cc:* Bruce Whitmore <bwhitm...@sbcglobal.net>
>> *Subject:* Stus-List Painting Flexofold props?
>>
>>
>>
>> Hello all,
>>
>>
>>
>> We are getting the bottom done on our 1994 C&C 37/40+, and at that time,
>> I am changing a rather old 3-blade prop in not the best condition to a 3
>> blade Flexofold.  The yard recommends applying Pettit 1792 to the running
>> gear.  When I asked Flexofold about this, they said to not paint it for the
>> first year, and see how it progresses.
>>
>>
>>
>> The only thing is, I don't intend on pulling the boat again until it
>> needs a new bottom job.
>>
>>
>>
>> Do any of you folks in salt water have Flexofolds (or feathering props
>> for that matter), and you you recommend applying the Pettit 1792?
>>
>>
>>
>> Thanks in advance for your insights
>>
>>
>>
>> Bruce Whitmore
>> _______________________________________________
>>
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