How much Propspeed do I need?

[Unclematt]

It is very pricey so I don't want to buy more than I will use. I have a 22" four blade prop, one transducer and and 8 below water thru hulls. Is there a best place to purchase other than Defender? Thanks

 

[Pete Meisinger]

Are you sure you want to use it on the transducer?

pete

 

[Unclematt]

I have never used it so advise me. I want to do the prop and rudder at least.

 

[ghost]

Twice I think I bought one size up from the small kit and had too much both times. My props are a bit bigger too. I think they are 27 or 28.

I’ll tell you this, read the instructions. The stuff doesn’t work if you screw it up, and that’s easy to do. Read the curing speed/steps carefully. I would not do it in warm weather, it kicks off FAST. Their recommendation to work with a partner is spot on. I do mine alone. Once it went terrible. Once it went well. The last time it was a little too warm. I kept up with the product curing, but barely, and I was cursing the whole way. My top coat was a little uneven in places as I was running out of time an going berserk speed. Remember, the product doesn’t care if you are not prepared, or tried really hard. Either you meet the curing speed perfectly or you might as well scrape it all and start over. It’s not a forgiving product.

I’d do props and shafts. For rudders, I’d instead apply interlux 2000 barrier coat. There is a bit of prep and effort with the 2000, but comparatively easy to apply a few coats. Then you can just bottom paint the rudders and lose the zincs on them too. Much easier future for just a little extra effort today.

Anyway, good product, but I’d also say most amateurs will screw it up and think it doesn’t work. I’m 2 for 3. Also if you get a yard to do it (good idea) do NOT take the lower bid. Yards screw it up frequently to of the b squad is called in to meet a lower cost.

 

[BandB]

It is very pricey so I don't want to buy more than I will use. I have a 22" four blade prop, one transducer and and 8 below water thru hulls. Is there a best place to purchase other than Defender? Thanks

Have you ever used Propspeed before? Yes, it's very pricey, but also the application is very involved and if not done 100% right, you'll be sadly disappointed. I'm a huge fan of Propspeed but not as a DIY product. Here is their application guide.

https://propspeed.com/products/prop...a0z75gtpg9UPLAf6eaD12Wx8bcmQX-rRoCROcQAvD_BwE

I'd recommend for DIY a simpler, slightly less effective product. Whoever you use for your bottom paint likely has one. I know Pettit does and so does Interlux.

 

[Nomad Willy]

I still use ArmorAll but PNW waters are relatively cool.

 

[Ken E.]

I have a boatyard apply Propspeed to shafts and props, no other metal. Used it for about 15 years and get about 3 seasons on it in the PNW. Ditto the comments on how critical the variables are in applying it...metal prep, drying time and temperature. As the yard explained, even a slight screw-up and you will get a bad result, guaranteed. Expensive, but it works well.