Should my antifoul be doing this?

[PEJ]

I had my antifoul done by a boat yard, I don't know what they used but I think it was "international" paint. It looked distictly grey when it was out of the water.

Now, about 6 weeks on, above the water it looks distinctly bluey/green. Below the water is looks very white and when I rub my finger on it clouds of white "smoke" come off in to the water.

Is this meant to happen?

 

[gibbowolfie]

Copper goes green when oxidising. Soft antifoul will rub off as that's what it's meant to do.

Sorry no idea I just thought it was mildy amusing. Don't worry someone with a mental age greater than 14 will be along in a moment.

Opps, hope you have a sense of humour!

 

[DAKA]

i thought that reply was accurate.
/forums/images/graemlins/smile.gif
Unusual but not wrong to have a soft antifoul on a planing craft.

You need to resist the temptation to scrub the side every week or the antifoul will wear off too quickly.

The ideal situation would be a coat of hard underneath so when it does wear off you have a fall back coat of hard waiting.

If you do a lot of miles at 25knt + you will need a really thick coat.

Next year you will have to continue to use soft or hard will flake off in a month or two.

International uno maybe a midway antifoul you could use next year but if you dont do many miles and the soft doesnt wear away i would stick with it.

 

[gibbowolfie]

It was an educated guess....

 

[LordJohn]

Yes International Ultra white displays these characteristics. I prefer International Trilux which stays white and in my area works better

 

[itsonlymoney]

Or better still dont use white antifoul cos looks orrible after a short time. Better IMO to use a dark colour ie. blue. Lasts way longer and looks way better IMHO

 

[jhr]

[ QUOTE ]
International uno maybe a midway antifoul

[/ QUOTE ] I suspect that's what has been put on this year, from his description. Works for me and - be honest now - how often do you get above 25 knots in the UK? /forums/images/graemlins/smile.gif

 

[DAKA]

Ultra is a hard a/f.
Does it release White powder into the water when rubbed with fingers ?
If it is ultra sounds like it is on top of a soft a/f ?

I would be concerned if this is the case , I hope not and I hope I am wrong.

 

[clivew05]

[ QUOTE ]
be honest now - how often do you get above 25 knots in the UK? /forums/images/graemlins/smile.gif

[/ QUOTE ]

Umm almost everytime I go out - my most economical speed is 2700rpm which is 27knts - sometime I go between 30-35knts and once got to 39.7 knts (have yet to top the 40) but she is a 36ft mobo so dont expect it to be too fast expecially when at the time I was fully loaded with water some 110galls and fuel 140galls and provisions for a whole weekend for the 4 of us - with the 4 crew on board too , in fact I only slowed below that once this year and that was a trip back from chatham last weekend 6/7th when it was a 6/7 and had to slow down to about 15knts to ride the storm ..... most times though its only a 3/4 and I can keep 25-27knts once on the plane without too much discomfort ,,, /forums/images/graemlins/grin.gif

 

[No1_Moose]

Yes, that's what we are going to do next week. We have one tin of white Interspeed Ultra left over from the last boat painting session which we will use above the waterline. The waterline and below will be painted in lovely black Interspeed Ultra, it's either going to look horrific or quite good.

 

[gibbowolfie]

or a coat of hard and a coat of soft!

 

[itsonlymoney]

Cant look any worse than all whit however I have my reservations about how clean whit AF will keep even above the water line, whay not just do it all black ?

 

[FAITIRA]

Sounds like the wrong system i,m afraid it wont last long at high speeds.

 

[jhr]

[ QUOTE ]
Umm almost everytime I go out - my most economical speed is 2700rpm which is 27knts - sometime I go between 30-35knts and once got to 39.7 knts (have yet to top the 40) but she is a 36ft mobo so dont expect it to be too fast expecially when at the time I was fully loaded with water some 110galls and fuel 140galls and provisions for a whole weekend for the 4 of us - with the 4 crew on board too , in fact I only slowed below that once this year and that was a trip back from chatham last weekend 6/7th when it was a 6/7 and had to slow down to about 15knts to ride the storm ..... most times though its only a 3/4 and I can keep 25-27knts once on the plane without too much discomfort ,,,

[/ QUOTE ] Yes, OK; I asked for that, didn't I? /forums/images/graemlins/grin.gif

Believe me, in a 22 footer you don't often get above the magic 25 knot mark, even when it's a relatively deep V like mine. Excessive speed in anything but the calmest conditions means that I start hearing a persistent whining noise - from my nearest and dearest.....

 

[clivew05]

[ QUOTE ]
Excessive speed in anything but the calmest conditions means that I start hearing a persistent whining noise - from my nearest and dearest.....

[/ QUOTE ]

/forums/images/graemlins/laugh.gif I found the answer to that take SWMBO out in a f8 for a mile - then back to the moorings - after that 5/6 is acceptable with only the comment of "well at least its not as bad as that time ......." ...... it worked no complaints about 5/6's now and in a pinch where its a we need to risk the 5 back - its "ok ..... " /forums/images/graemlins/grin.gif

 

[gibbowolfie]

[ QUOTE ]
Excessive speed in anything but the calmest conditions means that I start hearing a persistent whining noise - from my nearest and dearest.....

[/ QUOTE ]

I'd normally suggest replacing the offending part but maybe not prudent here /forums/images/graemlins/laugh.gif

 

[duncan]

as has been suggested...........

1. International White (dover white?) has a habit of looking a poor blue/green around the waterline where it is exposed to air (oxidising copper). The normal solution is to ensure the AF is below the water line at rest and paint a waterline band in trilux - either white or a contrasting colour of your choice. This has the added advantage of being more scrubable than even the ultra (hard racing) so you can run round mid season in the dingly with a hard brush and a cold beer 'doing essential maintenance'.
2. If they have used Ultra then you should be fine, and on an obviously planning powerboat they wouldn't use a soft eroding type......... /forums/images/graemlins/frown.gif, however if they have put on loads of coats you can get an initial release of particles. Easy test is to take a brush and scrub an area on the transom - if you loose a bit of 'powder' but the surface remains obviously antifouling - fine. If you quickly get back to primer or bare hull then stop the cheque and get them to redo properly!

 

[jhr]

[ QUOTE ]
I'd normally suggest replacing the offending part but maybe not prudent here

[/ QUOTE ] You're right - the trouble is, she'd probably remove a couple of my offending parts whilst being replaced.....

 

[peterandjeanette]

Sounds like my a/f International Trilux

Goes on like this

Comes out with a blue line on waterline

Very bad fouling on areas exposed to the sunlight, but not too bad right underneath

This was after 13 months on the Solent.

Good luck

 

[PEJ]

Thanks to everyone for the advice. It's only its second A/F the first coat was on it when I bought it brand new and it didn't behave the way the current coat is.

I will try the rubbing the transom idea. It does seem "knobely" still on the small bit that I rubbed that caused all the streaky mess in the water. I don't think it will go back to the gel coat but maybe it is going back to last years coat?

I can easily do up to 40 mph in calm seas but don't very often. Crusing at 27/28 is easy and being in Ocean Village all of my journeys include a good blast down southampton water.

Many of the boats around me have blue A/F but also some blue in the colour scheme. As you can probably see my boat is all white. Do you think blue A/F would look OK?