Bottom paint advice needed - SailNet Community
 2Likes
Reply
 
LinkBack Thread Tools
post #1 of 14 Old 01-08-2014 Thread Starter
Member
 
Join Date: Jun 2011
Location: Georgian Bay, Canada
Posts: 83
Thanks: 2
Thanked 4 Times in 4 Posts
Rep Power: 6
 
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
DSC_0663.jpg   DSC_0664.jpg   DSC_0666.jpg   DSC_0668.jpg  
skalashn is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 14 Old 01-08-2014
Senior Member
 
Sabreman's Avatar
 
Join Date: Sep 2006
Location: Yeocomico River, VA
Posts: 1,643
Thanks: 3
Thanked 18 Times in 15 Posts
Rep Power: 12
   
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"
Sabreman is offline  
Quote Quick Reply Share with Facebook
post #3 of 14 Old 01-09-2014 Thread Starter
Member
 
Join Date: Jun 2011
Location: Georgian Bay, Canada
Posts: 83
Thanks: 2
Thanked 4 Times in 4 Posts
Rep Power: 6
 
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?
skalashn is offline  
Quote Quick Reply Share with Facebook
post #4 of 14 Old 01-09-2014
Senior Member
 
Join Date: Dec 2010
Posts: 776
Thanks: 158
Thanked 67 Times in 63 Posts
Rep Power: 7
 
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.
Multihullgirl is offline  
Quote Quick Reply Share with Facebook
post #5 of 14 Old 01-09-2014
Senior Member
 
RichH's Avatar
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 4,231
Thanks: 37
Thanked 233 Times in 220 Posts
Rep Power: 18
   
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 12:20 PM.
RichH is online now  
Quote Quick Reply Share with Facebook
The Following User Says Thank You to RichH For This Useful Post:
skalashn (01-09-2014)
post #6 of 14 Old 01-09-2014 Thread Starter
Member
 
Join Date: Jun 2011
Location: Georgian Bay, Canada
Posts: 83
Thanks: 2
Thanked 4 Times in 4 Posts
Rep Power: 6
 
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?
skalashn is offline  
Quote Quick Reply Share with Facebook
post #7 of 14 Old 01-09-2014
Senior Member
 
RichH's Avatar
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 4,231
Thanks: 37
Thanked 233 Times in 220 Posts
Rep Power: 18
   
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.
;-)
RichH is online now  
Quote Quick Reply Share with Facebook
post #8 of 14 Old 01-09-2014
Senior Member
 
Join Date: May 2007
Location: Toronto, Canada
Posts: 449
Thanks: 0
Thanked 27 Times in 27 Posts
Rep Power: 10
 
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.
SVTatia is offline  
Quote Quick Reply Share with Facebook
post #9 of 14 Old 01-09-2014
Senior Member
 
RichH's Avatar
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 4,231
Thanks: 37
Thanked 233 Times in 220 Posts
Rep Power: 18
   
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'?
;-)
RichH is online now  
Quote Quick Reply Share with Facebook
post #10 of 14 Old 01-09-2014 Thread Starter
Member
 
Join Date: Jun 2011
Location: Georgian Bay, Canada
Posts: 83
Thanks: 2
Thanked 4 Times in 4 Posts
Rep Power: 6
 
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.
skalashn is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Bottom Paint Recommendation Needed rhr1956 Gear & Maintenance 4 09-10-2013 12:20 PM
Advice needed on non-mooring bottom paint pbpg Gear & Maintenance 3 09-17-2011 07:35 PM
Bottom Paint Advice DBboat Gear & Maintenance 11 07-09-2008 03:40 PM
Bottom Paint Advice. Triquetra Gear & Maintenance 15 04-20-2008 10:54 AM
Bottom Paint needed? Wannafish Gear & Maintenance 9 07-26-2007 12:43 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome