any advice please

[PAULFRAN]

had to ask as i cant get the search to work , im that new to this . i hope to take possesion of a 52ft degroot steel mobo , was thinking of sandblasting the hull underwater but what do i then use ? high zinc coating like zinga or rust converter and primer b4 antifouling ? with zinga do i still need anodes ? i think ive thought so much i dont have a clue now help please many thanks in advance


ref wife . if i do something its wrong , if i do nothing its wrong at least if i do nothing i know ive done nothing wrong

 

[VicS]

Welcome.

The paint manufacturers will be able to give you detailed advice on the preparation and priming of youl hull. You should follow that to the letter.

I have not looked but International's website at yachtpaint.com might be one place to start. In particular consult the manufacturer of the final paint system you intend using.

BTW 2nd bit of advice: give a more meaniful heading to your posts, please /forums/images/graemlins/smile.gif

 

[awol]

Underwater sand blasting is unlikely to work well! I'd start with the boat out the water. /forums/images/graemlins/smile.gif

 

[PAULFRAN]

cheers guys point noted on title . and although my explanation was a bit vague the boat is out of the water as the surveyor said his ultrasound equip wouldnt work to well submersed and he couldnt hold his breath long enough to do a good job

 

[macnorton]

You MUST steam clean the hull BEFORE sand blasting, if you don't you will just blast salt into the hull and wreck the boat.
Epoxy is the best but I would forget blasting, steam clean scrape and re-paint.

My parents had a DeGroot Beachcomer and the wheel house roof had been blasted in the past, rotted out and pain in the butt/wallet to put right.

Superb boat at sea! and yes you must fit anodes!

 

[VicS]

I had not heard of steam cleaning as a pretreatment before. It'll get rid of any oil or grease as well as salt I guess but washing should remove the latter. The prepared surface should be tested with potassium ferricyanide paper to confirm the removal of all the salt. See here

Grit blasting is the usual method of removing rust and scale as well as old coatings to produce a surface suitable for the new coating system. The Swedish Standard ISO 8501-1 is the relevant visual inspection standard. See here

Sorry I can't offer any more detailed advice on these but I have lost contact with the coatings technologists I used to work with

 

[PAULFRAN]

many thanks that all makes sence
paul