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Darken WRC when Epoxied

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Forum topic by SpottedGum posted 04-10-2018 10:25 AM 505 views 0 times favorited 6 replies Add to Favorites Watch
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SpottedGum

13 posts in 1199 days


04-10-2018 10:25 AM

I recently built a WRC cedar kayak. During construction every now and then I would wet the kayak timber down with a wet cloth to admire the colouring. But when I epoxied/fiberglass the kayak the timber colour darkened considerably.

As I want to build another kayak does anyone know how to prevent the darkening of the timber during the fiberglass stage – like a pre coat product or similar


6 replies so far

View Aj2's profile

Aj2

2321 posts in 2217 days


#1 posted 04-10-2018 01:47 PM

To prevent darkening don’t put epoxy on it. :^)

-- Aj

View RobHannon's profile

RobHannon

276 posts in 950 days


#2 posted 04-10-2018 02:20 PM

What epoxy did you use? If you are using West Systems, the 207 hardener is going to cure the clearest. Some sort of UV topcoat may be needed as well to protect the color. Around here the West Sytems distributors are very knowledgable. I would check with them in your area. I don’t know a lot about other marine grade epoxies other than they exist.

View CaptainSkully's profile

CaptainSkully

1610 posts in 3978 days


#3 posted 04-10-2018 04:10 PM

Wow, that’s weird. Usually the wood darkens with epoxy the same as with water. Was the epoxy noticeably dark, possibly due to age? Were there any additives? @RobHannon is spot on with 207 being the clearest epoxy you’ll be able to find.

One thing you might consider is some sort of sanding sealer on the cedar prior to epoxy, but I would definitely ask on a cedar strip forum to make sure that doesn’t interfere with the bonding of the epoxy. For me, I’d be more concerned about making it waterproof than a darker color. A lot of woods will get darker with age anyway.

-- You can't control the wind, but you can trim your sails

View jklingel's profile

jklingel

99 posts in 1577 days


#4 posted 04-12-2018 05:40 AM

Mine darkened somewhat, but mostly the colors just just stood out loud and clear. We used MAS and West Systems epoxy; seemed the same clarity to us. I think more darkening happened with the spar varnish than the epoxy, but I have no test pieces to verify that.

View John Smith's profile

John Smith

1880 posts in 582 days


#5 posted 04-12-2018 11:40 AM

Spotted – can you post some photos of your sample boards
as well as what other products you are using ??
it is hard to envision your issues just from the descriptions.

.

-- I am a painter. That's what I do. I paint things --

View runswithscissors's profile

runswithscissors

3052 posts in 2445 days


#6 posted 04-14-2018 05:13 AM

If you want the epoxy to adhere, I wouldn’t put any kind of sealer on it. AJ may have been facetious when he suggested not using epoxy, but then you can’t fiberglass it. And no, don’t even think about polyester resin. It has crappy adhesion to wood, and will soon delaminate.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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