Removing Bottom Paint - SailNet Community
 11Likes
Reply
 
LinkBack Thread Tools
post #1 of 68 Old 04-18-2013 Thread Starter
Senior Member
 
casey1999's Avatar
 
Join Date: Oct 2010
Location: HI
Posts: 3,311
Thanks: 20
Thanked 46 Times in 45 Posts
Rep Power: 5
 
Removing Bottom Paint

I need to remove old anti-foul bottom paint prior to applying new paint.

I have seen in the US most people use a sander, while overseas it seems scraping using a large scraper is used. Scraping may be cheaper (last time I sanded and the paint cloggs the sand paper quickly- went through a lot of sanding disc). Scraping might also be environmentally better as it seems to generate less dust.

Comments on best method?
casey1999 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 68 Old 04-18-2013
Senior Member
 
fallard's Avatar
 
Join Date: Nov 2009
Location: Mystic
Posts: 976
Thanks: 1
Thanked 14 Times in 13 Posts
Rep Power: 6
 
Re: Removing Bottom Paint

I've used a carbide scraper to remove built-up bottom paint on two boats. It's work, but it goes right along and it's a lot less messy than sanding. The carbide really holds its edge and there is no sharpening required. The sharp edge will literally fracture the bottom paint where it's thick and you can scrape the thin parts as if you are planing wood. I don't know what your options are for a power version, but you might damage your gel coat too easily if you aren't properly skilled. You can buy these scrapers at a hardware store, Home Depot, etc. and you can buy replacement blades, but you won't need them if you start off with a new scraper.
fallard is offline  
Quote Quick Reply Share with Facebook
post #3 of 68 Old 04-18-2013 Thread Starter
Senior Member
 
casey1999's Avatar
 
Join Date: Oct 2010
Location: HI
Posts: 3,311
Thanks: 20
Thanked 46 Times in 45 Posts
Rep Power: 5
 
Re: Removing Bottom Paint

Quote:
Originally Posted by fallard View Post
I've used a carbide scraper to remove built-up bottom paint on two boats. It's work, but it goes right along and it's a lot less messy than sanding. The carbide really holds its edge and there is no sharpening required. The sharp edge will literally fracture the bottom paint where it's thick and you can scrape the thin parts as if you are planing wood. I don't know what your options are for a power version, but you might damage your gel coat too easily if you aren't properly skilled. You can buy these scrapers at a hardware store, Home Depot, etc. and you can buy replacement blades, but you won't need them if you start off with a new scraper.
Sounds good. I would plan to use the non-powered version. I think I will give it a try.
Regards
casey1999 is offline  
Quote Quick Reply Share with Facebook
post #4 of 68 Old 04-18-2013
Newbie
 
DannyboyUpstate's Avatar
 
Join Date: Aug 2012
Location: Albany, NY
Posts: 52
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 4
 
Does the carbide scraper remove the anti-fouling and the barrier coat down to the gelcoat? I have to remove both and start over.
DannyboyUpstate is offline  
Quote Quick Reply Share with Facebook
post #5 of 68 Old 04-18-2013
Senior Member
 
fallard's Avatar
 
Join Date: Nov 2009
Location: Mystic
Posts: 976
Thanks: 1
Thanked 14 Times in 13 Posts
Rep Power: 6
 
Re: Removing Bottom Paint

Another thing: cover yourself as completely as possible. Get a tyvek suit, gloves, a good dust mask, goggles, etc. You will get some fine residue and it will not be nice when you get it in your eyes or nose. It's bad enough on your skin.

You ought to put down a drop cloth to catch the old paint. It should be required if it isn't. I used discarded shrink wrap last time and threw it out with the old paint debris.
downeast450 and gdr like this.
fallard is offline  
Quote Quick Reply Share with Facebook
post #6 of 68 Old 04-18-2013
Senior Member
 
fallard's Avatar
 
Join Date: Nov 2009
Location: Mystic
Posts: 976
Thanks: 1
Thanked 14 Times in 13 Posts
Rep Power: 6
 
Re: Removing Bottom Paint

Quote:
Originally Posted by DannyboyUpstate View Post
Does the carbide scraper remove the anti-fouling and the barrier coat down to the gelcoat? I have to remove both and start over.
If you get down to a barrier coat (Interlux 2000?) that is well adhered to the gel coat, you'd be better off to switch to sanding if you absolutely have to remove it. If the barrier coat is in good shape, I'd sand it lightly and wash it with the solvent recommended for the new barrier coat.
fallard is offline  
Quote Quick Reply Share with Facebook
post #7 of 68 Old 04-18-2013
Newbie
 
DannyboyUpstate's Avatar
 
Join Date: Aug 2012
Location: Albany, NY
Posts: 52
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 4
 
Quote:
Originally Posted by fallard View Post
If you get down to a barrier coat (Interlux 2000?) that is well adhered to the gel coat, you'd be better off to switch to sanding if you absolutely have to remove it. If the barrier coat is in good shape, I'd sand it lightly and wash it with the solvent recommended for the new barrier coat.
Well, this is a boat I just bought last fall. It sat on the hard for 20 years. It was on the ocean, and I'm lake sailing. I have no idea what the old paint is that's a problem because I want to put VC-17 on it and it must go onto its own barrier coat or it won't be right.
DannyboyUpstate is offline  
Quote Quick Reply Share with Facebook
post #8 of 68 Old 04-18-2013
Senior Member
 
fallard's Avatar
 
Join Date: Nov 2009
Location: Mystic
Posts: 976
Thanks: 1
Thanked 14 Times in 13 Posts
Rep Power: 6
 
Re: Removing Bottom Paint

The primer for VC-17m is Interlux 2000E, which is also a barrier coat. If you strip the bottom paint and get to a clean, hard surface and prep it with the appropriate solvent (202)for the 2000, you should be fine. I've used that system for both boats that I stripped. I didn't use VC 17m, but used CSC or ACT ablative copolymer bottom paint (both Interlux products) and it has worked very well.

After you apply several coats of the 2000E, you'll have to let it cure for a while before applying a vinyl bottom paint like VC-17. Interlux also recommends sanding the 2000E with 180 or finer grit before applying the VC-17m.

My suggestion is to read the instructions--something that can be hard for us guys: you won't regret it (assuming you follow the instructions!)
fallard is offline  
Quote Quick Reply Share with Facebook
post #9 of 68 Old 04-18-2013
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: 10
   
Re: Removing Bottom Paint

A friend gave me this great technique.....

I used a 3/4" wood chisel to "peel" 6 layers of paint. It was very fast, sharpening with a diamond sharpener every 20 minutes or so. I used a carbide tipped paint scraper on the keel and rudder. With 2 of us working, it took 8.5 hours. Then I used a 6" (30% more surface area than an 5") random orbit sander attached to a Shop-Vac. I sanded first with 60 grit, then 120 grit, 6 hours total. The shop-vac prevents sandpaper clogging and extends the life of the disk. Replace disks every 5' feet of hull, never try to make sandpaper "last".

Details and photos are in the link. Click the thumbnails for a larger image: Victoria Bottom Stripping & Fairing
scubadoo likes this.

Sabre 38 "Victoria"

Last edited by Sabreman; 04-18-2013 at 10:40 PM.
Sabreman is offline  
Quote Quick Reply Share with Facebook
post #10 of 68 Old 04-19-2013
Newbie
 
DannyboyUpstate's Avatar
 
Join Date: Aug 2012
Location: Albany, NY
Posts: 52
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 4
 
Quote:
Originally Posted by fallard View Post
My suggestion is to read the instructions--something that can be hard for us guys: you won't regret it (assuming you follow the instructions!)
Haha. Yeah, I'm with you. A young apprentice at my job used to tell a story about when he was in the military and some rebel (excuse the term) and he were teamed up and the guy told him "INSTRUCTIONS?! THAT'S THE FIRST THING IN THE TRASH!!!" So we say that all the time.

Last edited by DannyboyUpstate; 04-19-2013 at 06:07 AM.
DannyboyUpstate 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
Removing Bottom Paint -- Need Input sailingmorning Gear & Maintenance 28 04-08-2012 11:45 PM
Removing 10 coats of bottom paint... patrscoe Gear & Maintenance 36 01-30-2012 07:19 PM
Removing Bottom Paint: How far is too far? wesramm Gear & Maintenance 13 09-01-2008 10:16 AM
Removing Bottom Paint Dan Dickison Gear and Maintenance Articles 0 02-23-2001 07:00 PM
Removing Built-up Bottom Paint Tom Wood Gear and Maintenance Articles 0 09-13-2000 08:00 PM

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