How to ID bottom paint - 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? 
  #1  
Old 03-24-2012
Senior Member
 
Join Date: Nov 2008
Posts: 138
Thanks: 1
Thanked 3 Times in 3 Posts
Rep Power: 6
VallelyJ is on a distinguished road
How to ID bottom paint

Is there a way to tell hard from soft (i.e. ablative) bottom paint when it's on the boat?
I have to touch up a few spots--the paint looks sound otherwise, but I read that you can paint new hard over old hard, but not over old soft.
Is there any sort of hardness test to tell which is which?
Thanks.
John V.
Alajuela 33
Reply With Quote Share with Facebook
  #2  
Old 03-25-2012
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 8,817
Thanks: 10
Thanked 130 Times in 116 Posts
Rep Power: 6
Minnewaska will become famous soon enough Minnewaska will become famous soon enough
Re: How to ID bottom paint

Ablative means that it will continually shed the outer most surface of the paint, revealing fresh unexposed paint to continue its job. Obviously, putting hard paint over it, would be shed off as well.

Paint compatibility is tricky. Not all hard can be painted over all hard, etc, etc. I take it that it was last painted by a prior owner. Any way to get in touch and ask? Paint manufacturers are pretty good at publishing what can be painted over what. It can be brand and formula specific, no totally safe rule of thumb.

If the current paint has worn down to where skips need touching up, you are probably in need of a full paint job, even if the rest looks intact. Consider stripping, so you know where you stand.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Reply With Quote Share with Facebook
  #3  
Old 03-25-2012
hellosailor's Avatar
Plausible Deniability
 
Join Date: Apr 2006
Posts: 10,541
Thanks: 2
Thanked 82 Times in 80 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Re: How to ID bottom paint

As a guide but probably not a hard rule, if you can rub a white rag (t-shirt or towel) over the paint and it comes off on the cloth, that's soft paint and ablative. If you can't rub it off, that's hard paint.

If you want certainty, you probably have to strip the old paint, or just find something that's compatible "with everything" for your touchups.
Reply With Quote Share with Facebook
  #4  
Old 03-25-2012
Senior Member
 
Join Date: Nov 2008
Posts: 138
Thanks: 1
Thanked 3 Times in 3 Posts
Rep Power: 6
VallelyJ is on a distinguished road
Re: How to ID bottom paint

Thanks for the replies.
The PO is unfortunately not accessible.
The white rag trick is what I was hoping for--some way to test the hardness. I think if that test indicates a hard paint, I'll touch up the bare spots with another hard paint, maybe the Copper Pro SCX that PS recommends, and see how it does after another season. The remaining old paint is sound enough that it ought to be ok till then, so I may be able to avoid stripping the whole hull.
John
Reply With Quote Share with Facebook
  #5  
Old 03-25-2012
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 8,817
Thanks: 10
Thanked 130 Times in 116 Posts
Rep Power: 6
Minnewaska will become famous soon enough Minnewaska will become famous soon enough
Re: How to ID bottom paint

Looking sound doesn't mean it still works, just that it still sticks. If it is worn through in places, I'm willing to bet you are wasting your time and money.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Reply With Quote Share with Facebook
  #6  
Old 03-25-2012
Fstbttms's Avatar
I don't discuss my member
 
Join Date: Feb 2003
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 2,042
Thanks: 3
Thanked 18 Times in 18 Posts
Rep Power: 12
Fstbttms will become famous soon enough
Re: How to ID bottom paint

Quote:
Originally Posted by VallelyJ View Post
I read that you can paint new hard over old hard, but not over old soft.
Not true. Most commonly used, copper-based anti fouling paints are compatible with one another, whether they are hard or ablative. Here is a good chart illustrating what can be used with what:

Reply With Quote Share with Facebook
  #7  
Old 03-25-2012
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 8,817
Thanks: 10
Thanked 130 Times in 116 Posts
Rep Power: 6
Minnewaska will become famous soon enough Minnewaska will become famous soon enough
Re: How to ID bottom paint

It's a crap shoot not knowing what you have. Here is a brand specific compatibility chart.

http://www.pettitpaint.com/fileshare...patibility.pdf
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Reply With Quote Share with Facebook
  #8  
Old 03-25-2012
JimsCAL's Avatar
Senior Member
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,383
Thanks: 1
Thanked 34 Times in 33 Posts
Rep Power: 8
JimsCAL is on a distinguished road
Re: How to ID bottom paint

Sounds like your boat is "on the hard". Without knowing what you have on the bottom, you have to assume it is not a "multi-season" paint and thus a coat of paint is needed in any case. You don't want to launch and get into the season and find you have significant fouling and have to do a short haul to put some paint on.
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
Don Casey: Paint Waterline Stripe with Bottom Paint asdf38 Gear & Maintenance 21 05-29-2012 01:09 PM
Bottom paint prep, chipped paint josrulz Gear & Maintenance 16 02-14-2010 08:24 PM
Bottom paint Maverick1958 Gear & Maintenance 1 12-29-2009 10:50 AM
how much bottom paint do i need? mountforever General Discussion (sailing related) 4 12-17-2009 07:52 PM
Bottom Paint GhostBoat Gear & Maintenance 5 04-21-2003 10:06 AM


All times are GMT -4. The time now is 09:46 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.