 |
|
13-02-2016, 11:47
|
#1
|
|
Registered User
Join Date: Nov 2015
Posts: 104
|
Gelcoat can be successfully applied over Epoxy repairs
Here’s the test to prove it.
In the past, most pro’s would tell you that you have to paint over an epoxy repair.
Gelcoat is only for covering a Polyester repairs. It not true.
Gelcoat can be used over Polyester or Epoxy.
https://youtu.be/kHAbyglpp3M
|
|
|
|
13-02-2016, 12:15
|
#2
|
|
Moderator
Join Date: Jul 2009
Location: Sxm , Spain
Boat: CSY 44 Tall rig Sold!
Posts: 3,802
|
Re: Gelcoat can be successfully applied over Epoxy repairs
My opinion, Gelcoat over epoxy suck, and I see few vids from this guy in youtube, is quite funy, amine blush, that's it... all my experiments with gel over epoxy are good at first glance , after few months or even just few months exposed to the elements , the patch fail , I don't know why but definitely no matter how good and carefully the prep is done the adhesion fail, and my guess is amine blush no matter how well you sand or clean the epoxy job,, just my 2 cents...
|
|
|
|
|
13-02-2016, 12:46
|
#3
|
|
Registered User
Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 5,103
|
Re: Gelcoat can be successfully applied over Epoxy repairs
I plugged some holes from when I replaced a windlass with epoxy. Later I was having gelcoat work done and asked the guy to gelcoat over the plugs. The gelcoat failed after a few months.
I'm going to stick with the thought that it doesn't work based on that experience.
__________________
Ron
HIGH COTTON
|
|
|
|
|
13-02-2016, 13:00
|
#4
|
|
Resin Head
Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,205
|
Re: Gelcoat can be successfully applied over Epoxy repairs
Quote:
Originally Posted by neilpride
My opinion, Gelcoat over epoxy suck, and I see few vids from this guy in youtube, is quite funy, amine blush, that's it... all my experiments with gel over epoxy are good at first glance , after few months or even just few months exposed to the elements , the patch fail , I don't know why but definitely no matter how good and carefully the prep is done the adhesion fail, and my guess is amine blush no matter how well you sand or clean the epoxy job,, just my 2 cents...
|
Yep. Most time I've seen given in a test was by WEST, and they did the adhesion test 9 weeks after spraying gel. Not enough time. IME, failure usually occurs after year one but before year two. No gel over epoxy without a tie coat.
I believe this occurs because very small amounts of amine blush continue long after curing. This breaks down the poly at the bond interface. There is no such thing as a blush free polyamide-if it's a true polyamide epoxy, it blushes. Don't believe the hype!
I have yet to see a manufacturer suggest it is OK to put a structural poly layup over epoxy. If it's not okay to bond poly glass work to epoxy, why would it be ok to bond gel to it?
__________________
O you who turn the wheel and look to windward,
Consider Phlebas, who was once handsome and tall as you.
|
|
|
|
|
13-02-2016, 15:55
|
#5
|
|
Moderator
Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 20,605
|
Re: Gelcoat can be successfully applied over Epoxy repairs
Quote:
|
No gel over epoxy without a tie coat.
|
Minaret, w hat tie coat do you use?
im
__________________
Jim and Ann s/v Insatiable II, back in Cygnet where winter is looming and the solar panels are hibernating.
|
|
|
|
13-02-2016, 17:13
|
#6
|
|
Registered User
Join Date: Jul 2008
Location: Fort Lauderdale Florida
Boat: Northstar 1500, 35'
Posts: 318
|
Re: Gelcoat can be successfully applied over Epoxy repairs
Where would you even want to do this? Underwater? West/hi density e2000. Topsides? West/low density, micro balloons or ultralite, epoxy primer (545) Awlgrip or competitor equivalents. If a small gelcoat (small chip in precious non-skid pattern) repair is absolutely necessary, use polyester resin , it will stick adequately if prepped right...not as tenacious as epoxy bond, then match gelcoat...no mix and match for me...
Sent from my iPad using Cruisers Sailing Forum
|
|
|
|
|
13-02-2016, 17:16
|
#7
|
|
Senior Cruiser
Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43 and OPBs
Posts: 12,889
|
Re: Gelcoat can be successfully applied over Epoxy repairs
Quote:
Originally Posted by Jim Cate
Minaret, w hat tie coat do you use?
im
|
That extra space made me look twice! I first read that as an enquiry about his dress sense 
|
|
|
|
|
13-02-2016, 17:42
|
#8
|
|
Moderator
Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 20,605
|
Re: Gelcoat can be successfully applied over Epoxy repairs
Quote:
Originally Posted by StuM
That extra space made me look twice! I first read that as an enquiry about his dress sense |
OOOpsss! Bloody keyboard...
Good catch, Stu!
Jim
__________________
Jim and Ann s/v Insatiable II, back in Cygnet where winter is looming and the solar panels are hibernating.
|
|
|
|
|
13-02-2016, 22:17
|
#9
|
|
Resin Head
Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,205
|
Re: Gelcoat can be successfully applied over Epoxy repairs
Quote:
Originally Posted by Jim Cate
Minaret, w hat tie coat do you use?
im
|
545.
Not really a normal hat, tie and coat guy. Unless you count fullface respirator for hat, forced air line for tie, and a Tyvek for coat!
__________________
O you who turn the wheel and look to windward,
Consider Phlebas, who was once handsome and tall as you.
|
|
|
|
|
14-02-2016, 01:32
|
#10
|
|
Moderator
Join Date: Nov 2011
Location: aboard, cruising in Australia
Boat: Sayer 46' Solent rig sloop
Posts: 26,898
|
Re: Gelcoat can be successfully applied over Epoxy repairs
Quote:
Originally Posted by minaret
545.
Not really a normal hat, tie and coat guy. Unless you count fullface respirator for hat, forced air line for tie, and a Tyvek for coat!
|
Works for me!
__________________
Who scorns the calm has forgotten the storm.
|
|
|
|
|
14-02-2016, 01:46
|
#11
|
|
Registered User
Join Date: Aug 2007
Location: In boat fixing' season I'm in a Maryland boat yard too close to Washington, DC ... except when I escape to home on the beach in Florida!
Boat: Prout Snowgoose 34
Posts: 175
|
Re: Gelcoat can be successfully applied over Epoxy repairs
What is 545?
Sent from my iPhone using Cruisers Sailing Forum
|
|
|
|
|
14-02-2016, 02:01
|
#12
|
|
Resin Head
Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,205
|
Re: Gelcoat can be successfully applied over Epoxy repairs
Quote:
Originally Posted by svtrio
What is 545?
Sent from my iPhone using Cruisers Sailing Forum |
http://www.awlgrip.com/products/prim...xy-primer.aspx
__________________
O you who turn the wheel and look to windward,
Consider Phlebas, who was once handsome and tall as you.
|
|
|
|
|
14-02-2016, 11:37
|
#13
|
|
Registered User
Join Date: Apr 2011
Location: NZ
Boat: S34 Bob Stewart - 1959 Patiki class. Re--built by me & good mate.
Posts: 1,076
|
Re: Gelcoat can be successfully applied over Epoxy repairs
How about : gelcoat in female mold, 3/4oz csm polyester (waxed) peelply'd, wait thirty days , Then epoxy/ balsa layup.
Did it about five years ago, but just been launched-oh how I do not want to go back there.
|
|
|
|
|
14-02-2016, 11:40
|
#14
|
|
Registered User
Join Date: Dec 2015
Location: Geneva
Boat: Surprise
Posts: 9
|
Re: Gelcoat can be successfully applied over Epoxy repairs
Hi,
Gliders are made with epoxy only, and most often covered with gel coat. However, when repairing, you have to use the resin and gelcoat from the builder, or approved by the builder.
Never seen any problem of adherence of the gelcoat with the resin. On the other hand, glider's gelcoat must be refit every 15 years, the surface becoming damaged by small the larger cracks. Maybe not the same gelcoat !
|
|
|
|
|
14-02-2016, 12:44
|
#15
|
|
Resin Head
Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,205
|
Re: Gelcoat can be successfully applied over Epoxy repairs
Quote:
Originally Posted by lateral
How about : gelcoat in female mold, 3/4oz csm polyester (waxed) peelply'd, wait thirty days , Then epoxy/ balsa layup.
Did it about five years ago, but just been launched-oh how I do not want to go back there. |
That's epoxy on poly, should be golden.
__________________
O you who turn the wheel and look to windward,
Consider Phlebas, who was once handsome and tall as you.
|
|
|
|
|
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Rate This Thread |
 Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Advertise Here
 Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Vendor Spotlight |
|
|
|
|
|
|
|
|
|
