Cruisers Forum
 


Join CruisersForum Today

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 17-10-2019, 09:52   #1
Registered User

Join Date: Mar 2010
Posts: 6
two-part poly over varnish

I'm repainting a doug fir box mast and thinking of white from the spreaders up and varnish below. Will two-part poly stick to varnish or should I prime first?
__________________

12reasons is offline   Reply With Quote
Old 17-10-2019, 11:15   #2
Registered User

Join Date: Jan 2018
Posts: 988
Re: two-part poly over varnish

I know there are a lot of experts here, but this is one case I think I would call the manufacturer. I have made plenty of mistakes thinking things would work like this. The manufacturer always knows what to do. They know the compatibility better than anyone else. And they can even help you with some tips on surface preparation.
__________________

Chotu is offline   Reply With Quote
Old 17-10-2019, 11:23   #3
Registered User
 
Nicholson58's Avatar

Join Date: Jan 2011
Location: Caribbean live aboard
Boat: Camper & Nicholson58 Ketch - ROXY Traverse City, Michigan No.668283
Posts: 4,623
Images: 84
Re: two-part poly over varnish

Quote:
Originally Posted by Chotu View Post
I know there are a lot of experts here, but this is one case I think I would call the manufacturer. I have made plenty of mistakes thinking things would work like this. The manufacturer always knows what to do. They know the compatibility better than anyone else. And they can even help you with some tips on surface preparation.
I agree. Id start with the instructions on the can and go on line for the product if you need more definition. I know that two part over single component paint is a no no. Im sure youd rather do this only once.
Nicholson58 is offline   Reply With Quote
Old 17-10-2019, 12:50   #4
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,387
Re: two-part poly over varnish

Agreed, two-part poly is much tougher and might even partially melt the single as it is being applied. I don't think any two-part poly manufacturer will recommend the application over a single part varnish....but maybe with a compatible primer in between.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 17-10-2019, 13:19   #5
running down a dream

Join Date: Mar 2006
Location: somewhere in the deep south
Posts: 1,839
Images: 6
Send a message via Yahoo to gonesail
Re: two-part poly over varnish

if the varnish fails it will peel. why not just take the varnish off?
__________________
some of the best times of my life were spent on a boat. it just took a long time to realize it

gonesail is offline   Reply With Quote
Old 17-10-2019, 17:04   #6
Registered User
 
picklesandjesse's Avatar

Join Date: Apr 2014
Location: Northern NSW Australia
Boat: Cold Molded Davidson 32 Built NZ
Posts: 432
Re: two-part poly over varnish

Click image for larger version

Name:	Agnes 1975.jpg
Views:	46
Size:	70.3 KB
ID:	20167330 years ago we bought a boat in Marion Ma that was finished with Sterling which is/was a two part system. The hull was finished bright and looked beautiful. Below the Sterling there were 6 coats of Epifanes varnish that was a conventional varnish. It had been allowed to cure for 3 months before the Sterling was put on. So I believe that you can cover a conventional paint with two part if it has been on long enough and is fully cured. A few years later I stripped the hull back to bare wood and did the same thing in a boathouse near Vancouver BC and it worked out just fine. This time I used Captains varnish and finished with Awlbrite clear. Was still good 10 years later when the boat was shipped back to Sweden bought by the son of Peter Norlin who had designed the boat. Agnes is still around !!!! Pic shows her before first launch 1975. That boat went to weather like crazy !!
picklesandjesse is offline   Reply With Quote
Old 17-10-2019, 19:58   #7
Registered User

Join Date: Nov 2015
Location: Naples FL
Boat: Cheer Men PT41
Posts: 21
Re: two-part poly over varnish

3 part Awlbrite polyurethane is compatible with oil based varnishes
mickand is offline   Reply With Quote
Old 17-10-2019, 20:15   #8
Registered User
 
picklesandjesse's Avatar

Join Date: Apr 2014
Location: Northern NSW Australia
Boat: Cold Molded Davidson 32 Built NZ
Posts: 432
Re: two-part poly over varnish

Quote:
Originally Posted by mickand View Post
3 part Awlbrite polyurethane is compatible with oil based varnishes
After a few months only !!!! Sorry, should have made that clearer.
picklesandjesse is offline   Reply With Quote
Old 17-10-2019, 21:16   #9
Certifiable Refitter/Senior Wannbe
 
Wotname's Avatar

Cruisers Forum Supporter

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 9,809
Re: two-part poly over varnish

Quote:
Originally Posted by 12reasons View Post
I'm repainting a doug fir box mast and thinking of white from the spreaders up and varnish below. Will two-part poly stick to varnish or should I prime first?
I'm confused

What sort of two part poly are you referring to?

Polyurethane
Polyester
Poly-something-else
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is online now   Reply With Quote
Old 18-10-2019, 06:32   #10
Registered User

Join Date: Oct 2010
Location: Abaco, Bahamas/ Western NC
Boat: Nothing large at the moment
Posts: 962
Re: two-part poly over varnish

The reason for varnishing wooden masts is to be able to see any rot forming under the varnish. This would be impossible under white paint. I would also be concerned about moisture penetrating any cracks in the two part paint, which is much more brittle and les flexible than varnish. Remember your mast bends.
__________________

Tingum is offline   Reply With Quote
Reply

Tags
varnish

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
Tips for two-part poly paints scuttlebooty Construction, Maintenance & Refit 15 21-07-2019 12:40
Mexican 2-part poly paint experiences? autumnbreeze27 Construction, Maintenance & Refit 32 31-01-2017 22:43
Tinting 2 part Poly? over40pirate Construction, Maintenance & Refit 20 24-07-2015 17:36
Varnish over Polyurethane? And PU over Varnish? MarkJ Construction, Maintenance & Refit 8 06-08-2013 16:31
Poly or epoxy or varnish or oil; walnut counter round icebox Ketchgould Construction, Maintenance & Refit 0 26-02-2013 20:45

Advertise Here


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:51.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×

ShowCase vBulletin Plugins by Drive Thru Online, Inc.