Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 12-12-2015, 07:25   #16
Registered User

Join Date: Nov 2013
Location: Slidell, La.
Boat: Morgan Classic 33
Posts: 1,368
Re: Regular epoxy for barrier coat?

Originally Posted by jimbunyard View Post

I've also used West, System Three, Mas, Resin Research and a variety of off brand epoxies, and I can assure you West and System Three are definitely not impermeable to water. I've only used Mas on dance floors and table tops, so can't tell you about it, and the story is still out on Resin Research because I've not yet done any work on previously coated surfaces to find out. Off brand epoxies don't get used in critical applications.

Within any 'class' of resins there are different formulations, any of which will affect the properties of the specific resin.
Forgot to add that my comment about West and System Three epoxies is based on using products from at least 3 years ago. They may have changed their formulations, thereby modifying the physical properties of those products....

Obviously, it's always best for one to know what the specific properties of the actual product one is planning on using are, when evaluating them for their suitability for an application.

There may also be some issue I've not heard of using vinylester as a seal coat that I'm unaware of, and would appreciate if anyone who knows of any would speak up...

jimbunyard is offline   Reply With Quote
Old 12-12-2015, 07:45   #17
HappyMdRSailor's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: North Mississippi
Boat: 48 Wauquiez Pilot Saloon-C22 Chrysler Sunpiper- 19 Potter-Preparing to cruise w/my girl
Posts: 5,976
Re: Regular epoxy for barrier coat?

If it were me, I'd be using epoxy base coats of about 3, then epoxy fair, after these, 3 2000E coats, and then AF...

In the harsh marine environment, something is always in need of repair...

Mai Tai's fix everything...
HappyMdRSailor is offline   Reply With Quote
Old 12-12-2015, 09:37   #18
Registered User

Join Date: Dec 2015
Location: Nanaimo BC, Canada
Boat: C&C 33-2 33'
Posts: 3
Re: Regular epoxy for barrier coat?

Having done an extensive blister repair and barrier coat on An '84 San Juan 28, I used West epoxy for the blister repairs using their high density, low density and colloidal silica fillers (depending on how much damage was in each blister). Plus fibreglass cloth in some cases. When they were all fixed and faired, I used Interlux Interprotect 2000E for the REQUIRED 5 coats. I considered West epoxy with the barrier additive but for ease of use for a big job Interprotect 2000e was much easier to do, you just mix the two cans together and away you go. I had the boat for five years after that and had no reoccurrence of blisters. I now have an '86 C&C 33 that had an extensive bottom peel, epoxy re-glassing and five coats of Interprotect, no issues to date.
If it is a small repair, I'd go with West epoxy + their additive ( 422? ). If it is a whole bottom, Interprotect 2000e, just for ease of use if nothing else. They are both excellent products.
CuChulainn is offline   Reply With Quote
Old 12-12-2015, 11:13   #19
Marine Service Provider

Join Date: May 2012
Location: New Orleans
Boat: We have a problem... A serious addiction issue.
Posts: 3,980
Re: Regular epoxy for barrier coat?

Originally Posted by Reefmagnet View Post
I believe I've read in the past that vinylester won't require a barrier coat which indicates it's resistance to osmosis problems. I've not heard that vinylester can be used for barrier coats though.

Sent from my SGP521 using Cruisers Sailing Forum mobile app
This is generally true... BUT.

Even if the hull material (vinylester or epoxy) is impervious (or generally so) to water, one of the advantages of a barrier coat is that it ensures any small pores in the laminate layers are filled, and any stray fibers are wetted down and sealed. Barrier coats are also tinted differently than laminate epoxy which provides a clear visual guide when sanding bottom paint off years down the road when you have gone deep enough.


- If animals weren't meant to be eaten then they wouldn't be made of food.
Stumble is offline   Reply With Quote


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Any reason I'd regret sanding off my gelcoat for epoxy barrier coat? redpointist Construction, Maintenance & Refit 11 13-11-2014 20:12
Barrier coat for new epoxy rudders? andreas.mehlin Construction, Maintenance & Refit 3 03-03-2013 19:06
Do I Really Need an Epoxy Barrier Coat ?! Help Needed ASAP ! windtraveler Construction, Maintenance & Refit 29 14-01-2013 14:44
Epoxy Barrier Coat clifflindsey Construction, Maintenance & Refit 22 19-02-2012 19:28
Epoxy barrier coat and blisters StoutWench Construction, Maintenance & Refit 10 02-08-2005 20:28

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:19.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.