Extra layer of antifoul???

Hi all
Ready for the next antifouling experience and I'm wondering...would it be worth it to get a third coat of antifoul (Altex #5)? Would this lengthen the time interval between getting it done? I do have a diver clean my hull every two months or so and try to use the boat as often as possible. Not sure if it would be beneficial or just throwing more money into an already expensive process.

Cheers
Gos

I have a similar dilemma.
When MB was in Pittwater (Salt Pan Cove) I had her antfouled and about 9-12 months later had a diver clean her. Another 3 months later and maybe another clean 3 months on. Then an antifoul about 18 months after the previous one.
Now moored in Sydney at Drummoyne in about 3 metres under the keel at low tide I appear to have an entirely different problem.
I had MB antifouled and propspeeded on 4 December at Gladesville Bridge marina. In early April she desperately needed a thorough clean, speed under motor was down to low 4 knots, normally nearly 6.5 knots is normal after an anti foul. The prop was very barnacled.
Last week she appeared to be half way to another clean, speed was still at an average of 5.9-6.0 knots but the growth really growing.
Do Gladesville Bridge do a crap job, they were the cheapest quote at $2050 for the anti foul and prop speed, or is Sydney Harbour west of the bridge just a high growth area?

If its ablative then the more you put on the longer it should last. My boat had 12 litre on 38 ft and i made it last almost 4 years with some cleaning

MB,
I'm at Drummoyne also, with similar experiences. Last August she was anti fouled at Newbridge and by March was noticeably slower.

The prop had decent growth around the hub despite prop speed on it. Next time I might give prop speed a miss and see the difference.

I use the boat at least once a fortnight.

Cheers,
Evan

What type of ablative antifoul should I use around the lane cove river / Woodford bay area? My boat isn't near the current but I use it regularly so ablative is definitely the way to go. Altex #5?

Also anyone know of any little slip ways in the area where I can DIY.... I don't believe many exist anymore.... Any private one's about the place? There are a couple of little slip ways I see around the place that hardly operate like the one on the Western side of Woodford bay.. any recommendations on a cost effective slipway?

Altex 5 is as good as any. I have Micron on at the moment simply because I bought several tins cheap.

When is someone going to invent a little hull cleaning robot? Chuck it over the side after a sail or have it mounted on the yacht for a clean at pre-determined times. No haul out & no chemicals. They could even be mounted on a berth.

Cheers

Bristol

Yep, ssdd, as l am at Drummoyne West and after using Micron Extra for years with relative success l let myself sweet talk into Altex 5.
What a craps it is! Usual 3 coats plus 1 extra on the edges. After just a short year a whole zoo is growing on my bottom. Never seen kind of pink barnacles appeared and all the usual ones thrive as well. I must do a job on it soon.

I dived on it twice and cleaned it thoroughly but gently, still no good. Never touch Altex 5 again.
Going back to Extra this year.

Balmain Marina got deals for dit 3 day w.ends for about $1550 incl gurney use, your choice of 10l antifoul and a 2l primer (last years prices) but you do the slog.

In May 2014 I put on four coats of Altex No5 [manufacturer recommends a minimum of three when done with a roller] and last month I hauled out and redid her after three and half years. She wasn't to bad except around the water line where there was a little bit of green weed growth and the odd barnacle over the rest of the hull. I won't say anything about the prop of course.
I probably rubbed her down in-water about three time as well as doing 8 months cruising up to the Whitsundays and down to Lake Macquarie in that time.

I reckon I saved the cost of two haul outs and a 4lt tin of Altex No 5.

I must say that I had less growth by far, over the 4 coats, than when I only did 2 coats that usually lasted just over a year.

Needless to say I've just put four more coats on her and won't see a slip until around 2022

Altex#5 been on my boat for 18 months without a clean.,, 2 roller coats and 4 on the waterline,rudder and leading edges (aprox 9 lts)
I hauled out 6 months ago to remove the prop shaft and the hull paint was doing an awesome job along with the Velox prop paint.
Boat was on the stand for 10 days then, didn't touch hull or repaint the prop. There was some shell on the big hub of the Autostream prop that came off with very little effort but I was most impressed by the blades being rather clean.
I cleaned some shell off the prop a couple of months ago when checking underneath the boat, again,,very little shell on the blades.
Hauling out again next week for survey so I can have a good look again then at how all the paint is performing.

Supposed to antifoul at least every 12 months, and sounds like you pay someone to do it, do it yourself and save money, Once you scrape the bottom, the crustations become more aggressive, however this is also something you should do yourself if you chose to scrape the hull, (flippers, mask and scraper).