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Was the initial prep for bottom paint done correctly?

06Rinker27006Rinker270 Member Posts: 1,277 ✭✭✭
Hey Everyone,

Looking at the bottom paint that has chipped away and exposed the white hull I can see that some of it still has a glossy feel and does not feel sanded.  My concern is that this is not done correctly and will blister.  I have a few pictures but not sure you can tell.  The white is not rough but smooth. 




Patrick
06 Rinker 270

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    MarkBMarkB Member Posts: 3,969 ✭✭✭✭✭
    That looks like it's already been painted over with something black (see where flakes have previously come off, where there is black coating over).  What is that?

    There's no doubt, the manufacturer (Interlux) recommends a rough surface for barrier coat. They recommended that we sand blast our bottom. We did not remove all the gelcoat, just roughed up the surface and cleaned the mold release agent off.

    After that 4 coats of Interprotect Barrier Coat and 2 coats of Micron CSC (VC17 is also good).

    I had to raise my coating as the water line was going above it towards the back. They did not sand the raise properly and it basically all flaked off in 1 year. Not the original bottom, just the raise (about 1 or 2"). I had someone else redo it. They stripped the old paint, sanded properly and reapplied. I'm in my 3rd year, and the undercoat is sticking like crap on a cottontail. I haven't even had to touch up really, just in places where we knicked the anti-fouling during haul out.

    Boat Name: King Kong

    "Boat + Water = Fun"

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    06Rinker27006Rinker270 Member Posts: 1,277 ✭✭✭
    edited July 2015
    My concern is that I need to strip it all off and have it done properly.  I also need to raise the line as well, getting some yellowing up front.

    Has anyone had issues with Rinkers blistering or know if they had issues in the past?
    Post edited by 06Rinker270 on
    Patrick
    06 Rinker 270
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    StodgeStodge Member Posts: 2,738 ✭✭✭✭
    Some bottom paints are ablative and made to fall off over the course of the season.  You may have had a mix of bottom paint types applied.  I'd see about having the hull soda blasted and your choice of bottom paint applied.

    2002 FV 342 on Lake St. Clair - Past Commodore SHC - Vessel Examiner USCGAUX

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    MarkBMarkB Member Posts: 3,969 ✭✭✭✭✭
    Stodge, that is for the anti-fouling, not the barrier coat. The barrier coats are never made to fall off - they are the waterproof barrier to prevent blistering from osmosis. Anti-fouling, yes, some technologies like VC17 are ablative.

    06Rinker - when I had to fix my raise, we had to strip the old raise off, and even some of the original bottom to be able to blend the new barrier paint in properly. There are many companies that will offer to strip and repaint the bottom, it's a fairly common practice, especially when people don't know what is on their bottom paint and would like to start with a clean sheet. I wouldn't worry about it too much.

    Every boat is at risk of osmotic blistering. But I can tell you my gelcoat guy (who is always busy with gelcoat, fibreglass and paint) indicates that he rarely sees issues with Rinkers.  The risk is generally low.  I believe the gelcoat technology has improved in the last few years, and that osmotic blistering is less of an issue today.

    I know there is risk, and you may be concerned, but if it were my boat, I'd probably just leave the job for the fall. It will probably take you a month to find a good person, get a quote and get them booked anyhow.

    Boat Name: King Kong

    "Boat + Water = Fun"

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    06Rinker27006Rinker270 Member Posts: 1,277 ✭✭✭
    Thank you guys for the advice and opinions.  

    I am currently on a lift but I am going to a wet slip here in early August.  As you all agree the bottom needs something before it goes in.  Do you think its ok to just sand and repaint(which I will do myself) or should I do the barrier coat.  

    @Alswagg Do I remove all the bottom paint by sanding or do I do a chemical strip.
    Patrick
    06 Rinker 270
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    Handymans342Handymans342 Member Posts: 10,375 ✭✭✭✭✭
    All of that bottom paint needs to come off and the bottom prepped properly for paint. Cost me 4600 to do my boat from scratch because it had never been painted.
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    MarkBMarkB Member Posts: 3,969 ✭✭✭✭✭
    In my opinion I would do the barrier coat, if anything to put your mind at ease and when you sell the boat, it's a good selling point.

    Boat Name: King Kong

    "Boat + Water = Fun"

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    Handymans342Handymans342 Member Posts: 10,375 ✭✭✭✭✭
    OK, they sanded the bottom (all day job) 2 barrier coats and 2 bottom coats. 
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    Black_DiamondBlack_Diamond Member Posts: 5,439 ✭✭✭✭✭
    I was just quoted $3850 to sand blast off my old bottom paint, 4 coats of barrier paint, 1 coat of VC-17.  

    Past owner of a 2003 342FV
    PC BYC, Holland, MI
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    MarkBMarkB Member Posts: 3,969 ✭✭✭✭✭
    BD - get 2 coats of VC 17.

    What barrier paint are they using?

    Boat Name: King Kong

    "Boat + Water = Fun"

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    MarkBMarkB Member Posts: 3,969 ✭✭✭✭✭
    I paid $3500 Canadian, about $3000 US to sandblast a new bottom, apply 4 coats of Interprotect and 2 coats of micron CSC on my 260EC.  The guys up here in Canada are a little more expensive, due to probably less turn over.

    Boat Name: King Kong

    "Boat + Water = Fun"

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    Black_DiamondBlack_Diamond Member Posts: 5,439 ✭✭✭✭✭
    I was thinking 2 coats of the VC-17 too. I assume they are using the interlux for barrier coat. Good question though. 

    Past owner of a 2003 342FV
    PC BYC, Holland, MI
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    06Rinker27006Rinker270 Member Posts: 1,277 ✭✭✭
    edited July 2015
    I called the POs marina(South River Marina for those of you local to me) and they said they have records of the boat being sanded down, primed and painted.  This was more than 10 years ago, boat kept on lift, which is why the paint is flaking off.  My mechanic had a look and told me a proper standing and repaint would be just fine, no need to barrier coat and sand blast.  Thoughts?
    Patrick
    06 Rinker 270
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    MarkBMarkB Member Posts: 3,969 ✭✭✭✭✭
    06Rinker270 - what are you looking to achieve?  A top coat of anti-fouling paint is not an anti-barrier.  If you aren't worried about osmotic blistering, then I think you have your answer.  Osmotic blistering is always a risk in my eyes, especially at the water line.  If the boat is kept in water all the time, then maybe a barrier coat is a good idea. If it spends very little time in the water, and is on a lift when it isn't, then maybe you can skip that step.

    Boat Name: King Kong

    "Boat + Water = Fun"

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    06Rinker27006Rinker270 Member Posts: 1,277 ✭✭✭
    @Alswagg What do you use for prep wash?


    Patrick
    06 Rinker 270
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    06Rinker27006Rinker270 Member Posts: 1,277 ✭✭✭
    @AlswaggThanks for the info.  Do you think it be good for me to follow these steps?  Sand with 80 grit, get rid of all shiny spots and paint build up, prep wash, 2 coats of Petit or interlux like you said.
    Patrick
    06 Rinker 270
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    06Rinker27006Rinker270 Member Posts: 1,277 ✭✭✭
    Good to know thank you.  Last question...would I use the prep wash in my case as I am repainting?  vs adding paint for the first time.
    Patrick
    06 Rinker 270
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    06Rinker27006Rinker270 Member Posts: 1,277 ✭✭✭
    edited July 2015
    Is this the prep wash?




    Patrick
    06 Rinker 270
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    06Rinker27006Rinker270 Member Posts: 1,277 ✭✭✭
    I really appreciate all the advice.  
    Patrick
    06 Rinker 270
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