Smooth epoxy base for clear coat finish - 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? 


Like Tree5Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 03-11-2014
davidpm's Avatar
Senior Member
 
Join Date: Oct 2007
Location: Madison
Posts: 3,700
Thanks: 166
Thanked 40 Times in 33 Posts
Rep Power: 7
davidpm is on a distinguished road
Smooth epoxy base for clear coat finish

I have a dinghy board I have coated with clear epoxy, system 3.
The idea is to get a good base coat of epoxy then finish with lpu or varnish.

I'm having a bit of an issue getting the surface to be good enough.

After the first layer of varnish I sanded with a long board and still had some shiny spots. If I continued with the long board the epoxy would be all gone so I went with a piece of paper in my hand.

That worked better but still some shiny spots.
How critical is it to get all the spots out.
I plan on putting at least one maybe two more coats of epoxy.
Will it level out eventually.

I expect that the shiny spots will mess up the final finish, yes, no.

I'm committed to the epoxy base so if you could keep this thread on tract as to how to get the best epoxy base and how good it has to be I would appreciate it. I suspect a better job can be had with an all varnish approach.

In a related issue see the piece of sandpaper, it clogs pretty fast. Any way to keep that from happening?
Attached Thumbnails
Smooth epoxy base for clear coat finish-after-longboard-small-.jpg   Smooth epoxy base for clear coat finish-after-hand-sand-small-.jpg   Smooth epoxy base for clear coat finish-after-more-hand-sand-small-.jpg   Smooth epoxy base for clear coat finish-too-much-hand-sand-small-.jpg   Smooth epoxy base for clear coat finish-standpaper-clog-small-.jpg  

__________________
The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
Reply With Quote Share with Facebook
  #2  
Old 03-11-2014
capta's Avatar
Master Mariner
 
Join Date: Jun 2011
Location: somewhere in the Windward or Leeward Islands
Posts: 1,455
Thanks: 13
Thanked 71 Times in 66 Posts
Rep Power: 4
capta is on a distinguished road
Re: Smooth epoxy base for clear coat finish

Can you even get a varnish to adhere to an epoxy? I should think you will need to continue on with clear epoxy. And why would you want to put varnish, a much softer and fragile coating, over a durable and hard coating like epoxy? Am I missing something here?
__________________
"Any idiot can make a boat go; it takes a sailor to stop one." Spike Africa aboard the schooner Wanderer in Sausalito, Ca. 1964.

Last edited by capta; 03-11-2014 at 11:05 PM.
Reply With Quote Share with Facebook
  #3  
Old 03-11-2014
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,111
Thanks: 0
Thanked 71 Times in 62 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
Re: Smooth epoxy base for clear coat finish

Quote:
Originally Posted by capta View Post
And why would you want to put varnish, a much softer and fragile coating, over a durable and hard coating like epoxy? Am I missing something here?
Epoxy turns yellow if exposed to UV. If it is outdoors it needs protection or it won't last a season.

I have not had any problems varnishing over epoxy. I varnished over epoxy on a boat I used to own extensively, galley counters, backsplash, as well as the dining table. It looked great a decade after it was done. I used Epifanes gloss, a hard varnish.

David

Use a slow hardener and the epoxy should level better before it sets. I gave up on fast hardeners years ago as it doesn't give enough working time.
christian.hess likes this.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #4  
Old 03-11-2014
Senior Member
 
Join Date: Aug 2008
Location: Seattle
Posts: 257
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 7
baboon is on a distinguished road
Re: Smooth epoxy base for clear coat finish

If you have let the epoxy cure between coats it is important to get rid of glossy spots, but you need to remove very little epoxy to do so. I have used a green scotch pad with good results, just dull the surface to give the next coat some bite. more coats will level things out well.

Varnish looks great over epoxy, and as noted above will give it the UV protectin it needs. Wet sanding after the last coat of epoxy followed by 3-5 coats of varnish will give a very deep glossy finish.
Reply With Quote Share with Facebook
  #5  
Old 03-11-2014
jimgo's Avatar
Asleep at the wheel
 
Join Date: Sep 2011
Location: Pennsylvania
Posts: 2,916
Thanks: 71
Thanked 108 Times in 106 Posts
Rep Power: 4
jimgo is on a distinguished road
Re: Smooth epoxy base for clear coat finish

Dave, did you use a sanding sealer first? If not what you're doing is essentially using the first coat of epoxy as a sealer. You'll need to build up from there.
bljones likes this.
__________________
- Jim
Home: Western Philly 'burbs
1980 Allmand 31
1975 Albacore 15


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #6  
Old 03-12-2014
smj smj is offline
Senior Member
 
Join Date: Jun 2009
Posts: 112
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 6
smj is on a distinguished road
Re: Smooth epoxy base for clear coat finish

I would put the first coat on and let it kick. Then lightly sand out the air bubbles before putting the second coat on. Once the second coat is good and tacky but not yet kicked ad the third coat. Ad a fourth coat the same way you added the third coat if need be. This should give a smooth finish.
Reply With Quote Share with Facebook
  #7  
Old 03-12-2014
chucklesR's Avatar
Senior Member
 
Join Date: Sep 2007
Location: Pasadena Md - Magothy side
Posts: 5,978
Thanks: 10
Thanked 30 Times in 30 Posts
Rep Power: 10
chucklesR is a jewel in the rough chucklesR is a jewel in the rough chucklesR is a jewel in the rough
Re: Smooth epoxy base for clear coat finish

I concur, scuff sand with a pad, then coat with varnish as usual.
What you are doing with the epoxy is trying to get a flat and level surface, I contend you should do that with the much easier to lay and sand varnish.
__________________
Lessons learned are opportunities earned.
Reply With Quote Share with Facebook
  #8  
Old 03-12-2014
Senior Member
 
Join Date: Jun 2012
Posts: 119
Thanks: 4
Thanked 0 Times in 0 Posts
Rep Power: 3
Bruce_L is on a distinguished road
Re: Smooth epoxy base for clear coat finish

My trick is to use a slow cure epoxy. Mix it in a cup and use a heat gun to convert it from a thick syrup into a liquid thats a lot more fluid like. Dump it out, spread it with a toss-away brush and it will self level to a sheet of glass appearance. DONT do this this in the summer or you will have a real mess!!! Kicks too fast w/ the added heat. Also this is good for level surfaces where the epoxy wont run off downhill. I did some sliding hatches with this technique and sanding was minimal to get a slick finish. Almost looks like gelcoat after paint.

Practice with a small batch on a piece of scrap somewhere 1st. Just heat the epoxy till it thins... if its runny, your done heating...
__________________
The most expensive thing on the planet is a FREE boat!
Reply With Quote Share with Facebook
  #9  
Old 03-12-2014
christian.hess's Avatar
Senior Member
 
Join Date: Sep 2013
Location: el salvador
Posts: 3,825
Thanks: 100
Thanked 152 Times in 148 Posts
Rep Power: 2
christian.hess is on a distinguished road
Re: Smooth epoxy base for clear coat finish

Quote:
Originally Posted by capta View Post
Can you even get a varnish to adhere to an epoxy? I should think you will need to continue on with clear epoxy. And why would you want to put varnish, a much softer and fragile coating, over a durable and hard coating like epoxy? Am I missing something here?
this is very very common....

we did this to our h28 masts...reasoning being the epoxy is a great sealer, adds strength and abrasion resistance but has very little if any uv resistance

we used west systems...sanded rough so it wouuld grip the varnish better.

then varnish

we did 4 coats epoxy and about 6-8 varnish on my spruce masts....lasted a LOOOOOOOOOOOOOOOOOOOOOONG time...with not even a touch up for the first 3 years...

just my 2c
__________________
Finally sailed!!!!!!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

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

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Islander 36 refit still going on...

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #10  
Old 03-12-2014
Barquito's Avatar
Barquito
 
Join Date: Dec 2007
Location: Madison, WI
Posts: 1,959
Thanks: 0
Thanked 14 Times in 14 Posts
Rep Power: 7
Barquito is on a distinguished road
Re: Smooth epoxy base for clear coat finish

If you didn't wash with water between coats of epoxy, the stuff clogging the sandpaper could be blush. Anyone think it would help adhesion to apply the first coat of varnish while the last coat of epoxy is still tacky? I'm not sure about that one.
christian.hess likes this.
__________________
Bristol 27
Cirque
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
barrier coat as finish? Davoarts Gear & Maintenance 2 03-29-2010 04:00 PM
Epoxy Barrier Coat over Gel Coat? lizardheadone Gear & Maintenance 2 01-17-2010 08:52 PM
Should I clear coat my mast? docrn General Discussion (sailing related) 11 08-06-2009 08:00 PM
Repaint or clear coat? OhioTom Gear & Maintenance 1 06-15-2009 07:38 AM
2000 E as a primer base coat? funsailthekeys Gear & Maintenance 8 07-03-2008 12:26 PM


All times are GMT -4. The time now is 04:25 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.