Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 24-05-2022, 20:57   #1
Registered User

Join Date: Apr 2017
Location: Auckland, NZ
Boat: Cavalier 39 Mk1
Posts: 43
Using propane torch to remove barrier coat bubbles?

How to get rid of the bubbles that appear after applying with a roller? Iíve put on 3 coats of West System epoxy 105/206 (with black pigment to make it UV proof and more like paint) but a multitude of bubbles appear just as the epoxy is setting, and the next coat does not fill the little hole left by the bubble.
Iíve now sanded the bottom again, to provide a key, and I have built up enough courage to try again. I aim to put on another couple of layers. I hear conflicting stories about the additive 422 so Iíve not used it on the first layers.

Iíve got a propane torch, apparently torching over the surface straight after rolling will remove the bubbles?

Does anyone have first-hand experience with this that they will share please?
JeremyFowler is offline   Reply With Quote
Old 24-05-2022, 21:39   #2
Registered User

Join Date: Dec 2011
Location: New York
Boat: Columbia 50
Posts: 626
Re: Using propane torch to remove barrier coat bubbles?

Switch to barrier coat paint - interlux 2000e - no bubbles, and it’s made for the job. Why are you worried about UV on your bottom. It will never see the sun…..
Put bottom paint on over it.

If you are looking to do this on a little boat like your dink that spends a lot of time dry, paint it with a linear urethane like awlgrip, perfection, or an epoxy paint of your choice.

Whether you are intent on continuing with west, or switch to paint, or whatever, you roll and tip to knock down roller bubbles - drag a brush across the wet area after each roller load.

There’s a million articles and YouTube’s on rolling & tipping…..works great

Ps - if the subject is dark and the sun’s on it, that can cause gassing too - best to do the shady side and wait for the sun to move , or do a small project under cover.

Good luck on your project,

Matt
mlydon is offline   Reply With Quote
Old 25-05-2022, 03:55   #3
Senior Cruiser
 
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 47,029
Images: 241
Re: Using propane torch to remove barrier coat bubbles?

From West Systems ➥ https://www.westsystem.com/instructi...r-faq/#bubbles

WHY ARE THERE BUBBLES IN MY EPOXY COATING?

Air Is entrapped trapped in the epoxy coating. Air can easily escapes in the epoxy as the temperature of the epoxied surface rises. This is called outgassing.

A. To prevent outgassing, coat wood with epoxy as the temperature is droppingóafter warming the wood with heaters or during the later part of the day.

B. Apply a thinner epoxy coat, allowing air to escape easier.

C. Tip-off the epoxy coating with a roller cover brush to break bubbles.
See Barrier Coating ➥ https://www.westsystem.com/instructi...rrier-coating/

D. See Out-Gassing caution in Epoxy Chemistry, or read more about bubble-free coating at Epoxyworks.com.
https://www.westsystem.com/instructi...oxy-chemistry/
https://www.epoxyworks.com/index.php...epoxy-coating/
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 26-05-2022, 21:05   #4
Moderator
 
tkeithlu's Avatar

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 5,325
Re: Using propane torch to remove barrier coat bubbles?

I think that I would avoid the propane torch if at all possible, having tried the approaches Gord has laid out for you. Torches produce a very concentrated heat that can very quickly result in damage if not fire. If heat is needed, I suggest you try a heat gun first.

Good luck with it.
__________________
Never let anything mechanical know that you are in a hurry.
tkeithlu is offline   Reply With Quote
Old 28-05-2022, 12:27   #5
Registered User
 
Spot's Avatar

Join Date: Jan 2019
Location: Minnesota, USA
Boat: 21' trailer sailor & 8' sailing dinghy
Posts: 1,496
Re: Using propane torch to remove barrier coat bubbles?

I had an epoxy-used-as-paint finish over plywood go bad on me. The plywood underneath moved and cracked the epoxy, allowing water in which accelerated the cracking and moving process. Areas that were glassed did better but the veneers still wick and my damage is widespread, even where there is no direct sunlight or moisture. Had I covered the boat and/or painted it I could have avoided much the now-looming refinishing process. My composites supplier is a boat guy and he finished the bottom of his wood boat with a layer of epoxy followed by oil-based 'tractor' paint. He says he has 15 years on the paint with no issues.

All of this to say don't use epoxy where you need to use paint.
__________________
Big dreams, small boats...
Spot is offline   Reply With Quote
Old 29-05-2022, 03:21   #6
Registered User
 
Spot's Avatar

Join Date: Jan 2019
Location: Minnesota, USA
Boat: 21' trailer sailor & 8' sailing dinghy
Posts: 1,496
Re: Using propane torch to remove barrier coat bubbles?

PS It's not that I have NOT seen it done, the torch thing: for thick epoxy on bar tops and for fillets on wooden casting patterns. I just wonder how effective it would be on a thin film like a barrier coat or if it would aggravate the bubble mechanism. When I was doing more epoxy glassing I would either go first thing in the morning or wait for falling temperatures in the afternoon especially before doing fill coats. My incident with the plywood boat may have some special causes not related to Jeremy's project.
Is there time to run a test panel?
__________________
Big dreams, small boats...
Spot is offline   Reply With Quote
Reply

Tags
propane

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Barrier Coat Longevity Keegan Construction, Maintenance & Refit 9 24-05-2020 12:55
Do I Really Need an Epoxy Barrier Coat ?! Help Needed ASAP ! windtraveler Construction, Maintenance & Refit 29 14-01-2013 15:44
Fairing Under or Over Barrier Coat Sandero Construction, Maintenance & Refit 4 30-04-2010 14:55
Barrier Coat Project Benny Construction, Maintenance & Refit 11 11-03-2007 18:55
Epoxy barrier coat and blisters StoutWench Construction, Maintenance & Refit 10 02-08-2005 20:28

Advertise Here


All times are GMT -7. The time now is 20:21.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.