G
Guest
Guest
Can anyone tell me if it's a good idea to paint my stainless steel p-brackets with epoxy paint before antifouling ? someone said it's better not to antifoul, but what about those barnacles to say the least.
charles_reed
Active member
stainless
It's not really rustproof but relies upon a thin layer of impermeable chromate forming on the surface to protect it from further attack.
Putting epoxy on it is definitely a BAD IDEA as it will accelerate the corrosion underneath, which flourishes in SS in low oxygen environments.
In fact the most normal reason for stainless corrosion is crevice corrosion where the two sides of a crevice act as =ve and -ve sides of a galvanic cell - this can finish off a 12mm bolt in a season.
Antifouling, providing it is NOT a hard one is just NOT A GOOD IDEA. Hard antifouling is as bad as 2-part epoxy.
I hope this helps you in your dilemma.
It's not really rustproof but relies upon a thin layer of impermeable chromate forming on the surface to protect it from further attack.
Putting epoxy on it is definitely a BAD IDEA as it will accelerate the corrosion underneath, which flourishes in SS in low oxygen environments.
In fact the most normal reason for stainless corrosion is crevice corrosion where the two sides of a crevice act as =ve and -ve sides of a galvanic cell - this can finish off a 12mm bolt in a season.
Antifouling, providing it is NOT a hard one is just NOT A GOOD IDEA. Hard antifouling is as bad as 2-part epoxy.
I hope this helps you in your dilemma.
ccscott49
Active member
Re: stainless
Just leave it stainless, a polish might help to keep the barnys' off!
Just leave it stainless, a polish might help to keep the barnys' off!
Scubadoo
Well-known member
Re: stainless
Interesting, I noticed at the Sealine yard in Hamble that quite a few boats S/Steel trim tabs were antifouled (the hard type I think). I also know a guy who has always antifouled his trim tabs to no ill affect for many years, so is it really a big problem. I was considering this myself until I read you comments, what other alternatives are there?
Thanks
RM.
Interesting, I noticed at the Sealine yard in Hamble that quite a few boats S/Steel trim tabs were antifouled (the hard type I think). I also know a guy who has always antifouled his trim tabs to no ill affect for many years, so is it really a big problem. I was considering this myself until I read you comments, what other alternatives are there?
Thanks
RM.
G
Guest
Guest
Re: stainless
Does it also depend on the grade of stainless used
Mick
Does it also depend on the grade of stainless used
Mick
ArthurWood
New member
Re: stainless
I have anti-foul on shafts and trim tabs in warm, salt water with no problems in four years.
I have anti-foul on shafts and trim tabs in warm, salt water with no problems in four years.
Scubadoo
Well-known member
Re: stainless
Thanks for that, give me some confidence in a-foul mine.
RM.
Thanks for that, give me some confidence in a-foul mine.
RM.
miket
Active member
Re: stainless
Trim tabs not P brackets:
I am considering anti fouling tabs next spring, following heavy fouling in the second half of this year.
Has anyone painted, left for a few years and then inspected them?
Trim tabs not P brackets:
I am considering anti fouling tabs next spring, following heavy fouling in the second half of this year.
Has anyone painted, left for a few years and then inspected them?
ArthurWood
New member
Re: stainless
Although anti-fouled, my trim tabs seem to foul more readily than the rest of the "stern gear." However, fouling of the props has the greater effect on performance and trying to make a-foul stay on them is a challenge. I have a diver go down and inspect and/or clean the hull and running gear at intervals year-round. $50 a time for him saves me lot in fuel cost.
Although anti-fouled, my trim tabs seem to foul more readily than the rest of the "stern gear." However, fouling of the props has the greater effect on performance and trying to make a-foul stay on them is a challenge. I have a diver go down and inspect and/or clean the hull and running gear at intervals year-round. $50 a time for him saves me lot in fuel cost.
adarcy
New member
Re: stainless
Charles
Er maybe it's the way I read it but you say
<<Putting epoxy on it is definitely a BAD IDEA>> <<Antifouling, providing it is NOT a hard one is just NOT A GOOD IDEA>> and <<Hard antifouling is as bad as 2-part epoxy>>
Does that mean the only sensible option is SOFT antifouling or nothing at all?
Sorry if I'm dense but we tried leaving a bit of our S/S trim tabs uncovered and the weed was alarming.
Anthony
Charles
Er maybe it's the way I read it but you say
<<Putting epoxy on it is definitely a BAD IDEA>> <<Antifouling, providing it is NOT a hard one is just NOT A GOOD IDEA>> and <<Hard antifouling is as bad as 2-part epoxy>>
Does that mean the only sensible option is SOFT antifouling or nothing at all?
Sorry if I'm dense but we tried leaving a bit of our S/S trim tabs uncovered and the weed was alarming.
Anthony
charles_reed
Active member
Re: stainless
The secret is aeration - plenty of air happy stainless.
Certainly trimtabs really get fouled, mainly because they're wide open to sunlight - International are offering Micron 33 spray antifouling for the job (don't know how well it works), but I've never heard of trimtabs suffering galvanic corrosion, but P-brackets are a different matter.
Yes you should only use 316 A2 underwater - I had a 12mm castellated nut which fell apart in my hand after a season (it had been antifouled).
The original question was about using epoxy on P brackets - I would definitely and strongly recommend against that.
The secret is aeration - plenty of air happy stainless.
Certainly trimtabs really get fouled, mainly because they're wide open to sunlight - International are offering Micron 33 spray antifouling for the job (don't know how well it works), but I've never heard of trimtabs suffering galvanic corrosion, but P-brackets are a different matter.
Yes you should only use 316 A2 underwater - I had a 12mm castellated nut which fell apart in my hand after a season (it had been antifouled).
The original question was about using epoxy on P brackets - I would definitely and strongly recommend against that.
ccscott49
Active member
Re: stainless
Try rubbing on your props and polishing, "black lead" the stuff used for old fireplaces and pot belly stioves etc. Works very well and doesnt come off easy an OLD trick, before hard antifoulings, the guys with the morcambe bay prawners, used to do the whole hull with it, for the "races" I use it on my props all the time, good stuff!
Try rubbing on your props and polishing, "black lead" the stuff used for old fireplaces and pot belly stioves etc. Works very well and doesnt come off easy an OLD trick, before hard antifoulings, the guys with the morcambe bay prawners, used to do the whole hull with it, for the "races" I use it on my props all the time, good stuff!
ccscott49
Active member
Polish on "black lead" used for potbelly stoves and old fireplaces, to make them black and protect them, works very well on props, comes as a paste, but make sure it is genuine black lead, not some boot polish stuff!
ArthurWood
New member
Re: stainless
Thanks - there has been mention of this before on this BB. I might try it during haulout in Spring
Thanks - there has been mention of this before on this BB. I might try it during haulout in Spring
Scubadoo
Well-known member
Do you know where it is available?
Thanks.
RM.
Thanks.
RM.