Antifoul (again)

[BobA]

I hope this question doesn't generate the same level of argument as my previous question about TV's /forums/images/graemlins/tongue.gif

Up until now my boat has been kept on her trailer and launched/retrieved by the yard as required - this year they are putting in a new set of serviced pontoons (25/30 berths0 and as a current customer I get an option of a berth.
The boat is 21.5 ft outboard(90hp) powered cuddy style.
My questions are
1- that at the moment when the boat is wet I can rub my hand along the remnants of the previous A/F and it comes off blue on my hand. Therefore am I correct in assuming that it is in fact Erodable and if so what would the benefit or otherwise in removing it and using hard?
2 - would a Karcher type jet washer remove it sufficiently to do this?
3 - Should I just recoat the erodable with 2 or three coats as the work in removing it in preparation for Hard A/F would not be worth the effort?

Bob

 

[alienzdive]

Yes it is erodable,

2-3 coats of erodable is sufficient, but best wait until the old stuff is slightly patchy or not so erodable, ie at the end of its useful life, approx 1-2 years of immersion.

May require a waterblast as well as a wet and dry sand with a hose and 80g wet and dry san paper.

Yes you are correct, unless you are specifically enclined to using a hard antifoul, stick with the ablative, as all traces of ablative require to be removed prior to applicaiton of hard type.

 

[pvb]

Removing erodable...

I find that a good way to remove erodable antifouling is to scrub with a nylon pan scourer whilst running water over it with a hosepipe.

Unless you want to race, erodable antifouling has the big advantage of causing very little build-up of paint over the years.

 

[tgalea]

Re: Removing erodable...

I used two coats of International self eroding. Boat has been in the water for 6 months and will soon be laying up.

Would the remaining antifouling be good to relaunch again in 4-5 months time ?

Thanks
tyrone

 

[andy_wilson]

The correct a/f for a planing (I assume) power craft would be a hard type, which is still erodable, just not as much as the soft stuff sailors use.

Best to try to find out / remember what was put on before and consult the paperwork provided by the manufacturers of what you are intending to use, to see what compatibility or what barrier coat is needed.