Bottom paint advice needed - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 


Like Tree2Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 01-08-2014
Member
 
Join Date: Jun 2011
Location: Oakville, Ontario, Canada
Posts: 42
Thanks: 2
Thanked 3 Times in 3 Posts
Rep Power: 0
skalashn is on a distinguished road
Bottom paint advice needed

Bottom paint on the new to me Beneteau 361 is flaking in spots, probably because of too many layers, and I was wondering what should I do about it before the start of next season. The options are: do nothing, touch up or paint another layer. I know eventually I would have to remove the old paint and start from scratch, but I would rather not do it this year. The paint is Interlux Micron (ablative), and the boat is in fresh water.
Attached Thumbnails
Bottom paint advice needed-dsc_0663.jpg   Bottom paint advice needed-dsc_0664.jpg   Bottom paint advice needed-dsc_0666.jpg   Bottom paint advice needed-dsc_0668.jpg  
Reply With Quote Share with Facebook
  #2  
Old 01-08-2014
Sabreman's Avatar
Senior Member
 
Join Date: Sep 2006
Location: Yeocomico River, VA
Posts: 1,590
Thanks: 2
Thanked 14 Times in 11 Posts
Rep Power: 9
Sabreman will become famous soon enough Sabreman will become famous soon enough
Look around Sailnet and you'll see that your problem isn't that bad at all.

I'd get a 6" random orbit sander from Home Depot and attach it to a shop Vac. Sand the entire bottom using 100 grit paper changing every 10 or 15 minutes (2 hrs), dust off, and then apply new paint. Even though I removed all the paint a few years ago, This is what I do each year using Petit Hydrocoat. The key to keeping it from flaking is sanding.

It's not that bad. In 4 or 5 hours you'll be sore but done.
__________________
Sabre 38 "Victoria"
Reply With Quote Share with Facebook
  #3  
Old 01-09-2014
Member
 
Join Date: Jun 2011
Location: Oakville, Ontario, Canada
Posts: 42
Thanks: 2
Thanked 3 Times in 3 Posts
Rep Power: 0
skalashn is on a distinguished road
Re: Bottom paint advice needed

You are right the old paint is still looking good...that and the fact that I hate sanding and dealing with dust are the reasons I am reluctant to do anything serious about it this year...

Are you suggesting sanding down to the barrier coat or just prepping the old surface and painting over? How toxic is the dust? What kind of protection would I need?
Reply With Quote Share with Facebook
  #4  
Old 01-09-2014
Multihullgirl's Avatar
don't like leanin'
 
Join Date: Dec 2010
Location: gulf coast MS
Posts: 499
Thanks: 133
Thanked 38 Times in 36 Posts
Rep Power: 4
Multihullgirl is on a distinguished road
Re: Bottom paint advice needed

I did my own work and therefore learned that the best way to have your boat's bottom done is with your pocketbook.

Of course the dust is toxic - the paint is specifically designed to kill things, isn't it?

If you would like to do it really right, have it blasted to the gelcoat, then apply a barrier coat, then the paint of your choice.
Reply With Quote Share with Facebook
  #5  
Old 01-09-2014
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,812
Thanks: 9
Thanked 71 Times in 64 Posts
Rep Power: 15
RichH will become famous soon enough
Re: Bottom paint advice needed

Ablative paint such as Micron does this when too too many layers are built up and the earlier under-layers start to loose adhesion. The real solution is to only paint with ablative paint when you NEED to apply ablative paint. The best way to do this is to use a different color for the 'first coat' and only paint again when this 'indicator' coat is showing through.

Best /fastest way to get this off is to use a Fein tool (vibratory multi-tool) with a sharpened chisel blade attached and held at a very low angle. Remove only those sections that have poor adhesion and are easily removed, and wait (another year or two) for those that do not. Sand well, down into where the paint has been removed and fair the edges of where you stopped chiseling with 'thickened' new paint (mix of micro balloons + new paint) and a plastic TROWEL. Take pictures of those sections that need to be chiseled away so that you dont needlessly remove the paint later on when those sections not chiseled begin to lose their adhesion.
This will save time and money ... and shoulder 'bursitis'.

The SMOOTHER you apply Micron, etc. the longer it will last - think 'racing bottom' smooth. Suggest you apply Micron with a thin yellow WEST SYSTEM roller, then 'tip' your final coat with a polyethylene trowel ... but Im a 'fanatic' that likes my 'bottoms' to be smooth as a baby's ass.

Pic is 'after' chiseling with a Fein Tool. The layer that failed was the original 13 y/o indicator coat.


;-)

Last edited by RichH; 01-09-2014 at 11:20 AM.
Reply With Quote Share with Facebook
The Following User Says Thank You to RichH For This Useful Post:
skalashn (01-09-2014)
  #6  
Old 01-09-2014
Member
 
Join Date: Jun 2011
Location: Oakville, Ontario, Canada
Posts: 42
Thanks: 2
Thanked 3 Times in 3 Posts
Rep Power: 0
skalashn is on a distinguished road
Re: Bottom paint advice needed

Thanks - this might be exactly what I am looking for if I decide to go that route. Wondering if all this scraping is safe for the original barrier coat?
Reply With Quote Share with Facebook
  #7  
Old 01-09-2014
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,812
Thanks: 9
Thanked 71 Times in 64 Posts
Rep Power: 15
RichH will become famous soon enough
Re: Bottom paint advice needed

If you 'get down' to barrier coat, you'll need to 'roughen' it - 100 grit is the choice, just roughened to provide sufficient 'tooth' for the new paint, dont deeply 'sand' into the barrier - especially if you dont know the original lay-up thickness of the barrier.
If the OEM barrier is found to be 'rough' (very pimply) as when applied with a shaggy roller, then consider to 'fair' the surface with epoxy + micro-balloons, etc. before applying new paint.

If the boat was 'hot coated' - bottom paint applied over partly cured barrier - then Id suggest that you also scrub with HOT water to remove any 'amine blush' that formed during the 'curing' of the barrier. Since you dont know, Id suggest a HOT water scrub then 'roughen'.
Boats that are 'hot coated' are more prone to such 'flaking' of their ablative bottom paint later on - just my suspicion.
You dont want to do this job 'twice'; now and several years again in the immediate future.
;-)
Reply With Quote Share with Facebook
  #8  
Old 01-09-2014
Senior Member
 
Join Date: May 2007
Location: Toronto, Canada
Posts: 255
Thanks: 0
Thanked 8 Times in 8 Posts
Rep Power: 8
SVTatia is on a distinguished road
Re: Bottom paint advice needed

Quote:
Originally Posted by RichH View Post
...Best /fastest way to get this off is to use a Fein tool (vibratory multi-tool) with a sharpened chisel blade attached and held at a very low angle. Remove only those sections that have poor adhesion and are easily removed, and wait (another year or two) for those that do not. Sand well, down into where the paint has been removed and fair the edges of where you stopped chiseling with 'thickened' new paint (mix of micro balloons + new paint) and a plastic TROWEL...
Would work, but you are just postponing the inevitable - because you have so many coats, you'll have to remove all the paint and do it again someday. Also, there are other brands of multitool for this job, Fein is the most expensive, and its hard to use because its corded.

Quote:
Originally Posted by skalashn View Post
Thanks - this might be exactly what I am looking for if I decide to go that route. Wondering if all this scraping is safe for the original barrier coat?
Are you sure you have a barrier coat or just the gelcoat? If it is just the gelcoat, I would just sand and paint over the patches, then later on when you are ready, have someone soda blast the paint off (PM me for recommendation - I am doing it on my boat this year) and you then apply the barrier coat and new bottom paint. This will be the ultimate protection.
Reply With Quote Share with Facebook
  #9  
Old 01-09-2014
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,812
Thanks: 9
Thanked 71 Times in 64 Posts
Rep Power: 15
RichH will become famous soon enough
Re: Bottom paint advice needed

Quote:
Originally Posted by SVTatia View Post
Would work, but you are just postponing the inevitable - because you have so many coats, you'll have to remove all the paint and do it again someday.
My preference is to only do this backbreaking job as necessary and as needed, removing only the paint that has failed adhesion.
Sure, eventually all will be removed but not as one whole single-step whopping job. With Micron CSC now approaching ~US$200/US gallon (Micron extra @ ~$240/gal) why would anyone prefer to remove such expensive paint especially if its still 'adhering' and still 'working'?
;-)
Reply With Quote Share with Facebook
  #10  
Old 01-09-2014
Member
 
Join Date: Jun 2011
Location: Oakville, Ontario, Canada
Posts: 42
Thanks: 2
Thanked 3 Times in 3 Posts
Rep Power: 0
skalashn is on a distinguished road
Re: Bottom paint advice needed

I am sure the boat has barrier coat since new. Soda blasting and starting over is another option I would like to explore, although it does seem wasteful considering the overall condition is not so bad.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Bottom Paint Recommendation Needed rhr1956 Gear & Maintenance 4 09-10-2013 11:20 AM
Advice needed on non-mooring bottom paint pbpg Gear & Maintenance 3 09-17-2011 06:35 PM
Bottom Paint Advice DBboat Gear & Maintenance 11 07-09-2008 02:40 PM
Bottom Paint Advice. Triquetra Gear & Maintenance 15 04-20-2008 09:54 AM
Bottom Paint needed? Wannafish Gear & Maintenance 9 07-25-2007 11:43 PM


All times are GMT -4. The time now is 05:27 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.