I have a friend with a 38 ft Bavaria, last time it was anti fouled he was told that osmosis was appearing. He told me
he was considering getting the boat soda blasted and the osmosis dealt with. Should he do this at this early stage or
does he need to wait until a lot more blisters appear ??. If the job is done too early is there a risk of blisters appearing
at a later stage, or, once the job is done it stays done and no more trouble ??.
Soda blasting is for delicate cleaning, things like aircraft undercarrages etc. Sand blasting or some other media would be required to open blisters. I would suggest your mate tries some other yard or does the job himself. Just repair the obvious blisters and repaint and get the boat back in the water. There are less sharks in the water.
Select to expand quoteRamona said..
Soda blasting is for delicate cleaning, things like aircraft undercarrages etc. Sand blasting or some other media would be required to open blisters. I would suggest your mate tries some other yard or does the job himself. Just repair the obvious blisters and repaint and get the boat back in the water. There are less sharks in the water.
boom !......tish !!!
I had MB soda blasted to remove the antifoul. It won't remove blisters, just expose them.
As it turned out there were no blisters but I ended up with a lovely smooth bum and a much faster boat. And the knowledge there wasn't a problem under 1/2" of antifoul.
Select to expand quoteMorningBird said..
I had MB soda blasted to remove the antifoul. It won't remove blisters, just expose them.
As it turned out there were no blisters but I ended up with a lovely smooth bum and a much faster boat. And the knowledge there wasn't a problem under 1/2" of antifoul.
Can I ask how long ago and how much it cost?
cheers
I had a SeaRay 260DA Soda blasted about 3 years ago at Taren Point, probably similar underwater wetted surface, excluding the keel, and I am sure sail boat shapes are nicer to access. It cost me $1500.
from experience, make sure you plug up or shut all seacocks!
The dust gets everywhere.
How old is the Bavaria in question? Mine is a 2006 and I have not heard of osmosis as a common issue on these boats, to date!
cheers Richard
I soda blasted my 34ft a few years ago then used a dremel to bore out any osmosis. Dried out the hull for about 4 months then expoxied and finished off with a couple of barrier coats. Problem appears to have been solved, last two haulouts have no problems or issues. Main trick was to high pressure clean the hull weekly to remove any crap that had oozed out of the hull. Then sticky tape a few exposed spots to ensure the hull had dried. Once I stopped getting moisture appearing on the inside of the plastic I knew I had a dry hull.
I think the soda blasting cost around $1,000 and total cost was around $6k.
Ilenart
Select to expand quoteStockie said..
I had a SeaRay 260DA Soda blasted about 3 years ago at Taren Point, probably similar underwater wetted surface, excluding the keel, and I am sure sail boat shapes are nicer to access. It cost me $1500.
from experience, make sure you plug up or shut all seacocks!
The dust gets everywhere.
How old is the Bavaria in question? Mine is a 2006 and I have not heard of osmosis as a common issue on these boats, to date!
cheers Richard
Stockie, his boat would be a similar age. He's had it for years but I'm unsure if he bought it new. He's
not looking to sell it but he's disappointed that the osmosis has occurred. He won't be doing any of
work himself so it sounds like he's got a big problem. I know boats don't sink because of osmosis but,
he can still do without it.
Select to expand quoteCockpit said..MorningBird said..
I had MB soda blasted to remove the antifoul. It won't remove blisters, just expose them.
As it turned out there were no blisters but I ended up with a lovely smooth bum and a much faster boat. And the knowledge there wasn't a problem under 1/2" of antifoul.
Can I ask how long ago and how much it cost?
cheers
About 5 years ago at Sirsi in Pittwater. It was done with other work but all up with an antifoul and prop speed about $5,000.
Soda blasted my boat, cost about $1600 at about $160 /hr plus $50 per bag of bi-carb
Should of stopped the guy after about 5min because it was clear then that the gelcoat was going to have to come off
The soda blast only cleans it doesn't it. The actual treatment entails the gelcoat stripped off...what then ?. Does it
have to be out of the water for any length of time to dry out etc ...is it a slow process ?.
Hi Sam,
I had my old boat out for rectification of some small osmosis blisters, it took about 5 days to drain and dry properly. It really would depend though on how bad and how long the hulls been acting like a sponge. I've heard of much longer periods but that's general bar talk, nothing substantive.
Hi Sam, It's not so much the drying but the flushing of the chemicals out of the laminate..... then drying. If you don't neutralise the chemicals then no amount of drying will get rid of the problem. They will come back.
Lots of flushing with fresh water.
Wow....I've just read the post about vinyl wrapping and wondered if that could be a way out for him.
Select to expand quotesamsturdy said..
Wow....I've just read the post about vinyl wrapping and wondered if that could be a way out for him.
A few small blisters are easily ground out, repaired and top coated. Unless it is extensive and serious just repair it as needed.
My 33 foot boat was done a bit over 3 years ago.
They also ground out the previously poorly repaired blisters was out for about 2 weeks.
3 years later no new blisters.
