Dark Color Effect on Epoxy/Plywood?

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Mike19
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Dark Color Effect on Epoxy/Plywood?

Post by Mike19 » Wed Nov 22, 2017 12:40 pm

Would a dark color absorb more heat and have a negative effect on a stich & glue boat as opposed to a light color ?



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Re: Dark Color Effect on Epoxy/Plywood?

Post by pee wee » Wed Nov 22, 2017 12:53 pm

In Florida, or anywhere it gets hot, yes. If it's the hull sides, then the biggest problem you're likely to have is cosmetic- after a number of heat cycles (noon, night, noon, etc.) the weave of the fiberglass can telegraph through the finish paint. If it's the deck or sole, then it's also a matter of getting too hot to touch, of course. I don't think there is any effect on the plywood, just the epoxy/fiberglass.
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Mike19
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Re: Dark Color Effect on Epoxy/Plywood?

Post by Mike19 » Wed Nov 22, 2017 2:03 pm

What does telegraph through the finish mean?

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Re: Dark Color Effect on Epoxy/Plywood?

Post by terrulian » Wed Nov 22, 2017 2:41 pm

What does telegraph through the finish mean?
It means that after all your hard work filling the weave and adding fairing/sanding/adding fairing/sanding/adding fairing/sanding/adding fairing/sanding/adding fairing/sanding/adding fairing/sanding, so as to obtain a perfect mirror finish on the final coat, you will begin once again to see and perhaps even feel the weave of the cloth. 8O :roll:
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Re: Dark Color Effect on Epoxy/Plywood?

Post by cape_fisherman » Wed Nov 22, 2017 4:08 pm

Most folks call that "print through". The glass, and other things below the skin, can sometimes print.

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Re: Dark Color Effect on Epoxy/Plywood?

Post by fallguy1000 » Wed Nov 22, 2017 8:55 pm

There are ways to deal with printthrough, though.

You can postcure the boat before painting. Essentially, you heat the boat up to above the exposure temperatures.

You can put a thin barrier of csm over the glass.

Probably smarter people than me know some solutions. Dark isn't as easy, but far from impossible.
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Re: Dark Color Effect on Epoxy/Plywood?

Post by Aripeka Angler » Wed Nov 22, 2017 9:14 pm

I've not noticed glass telegraphing or printing through the finish on my bright red boat.
It's been sitting completely uncovered in sun for almost a decade.
The paint has however faded noticeably over the last couple of years.
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Re: Dark Color Effect on Epoxy/Plywood?

Post by Eric1 » Thu Nov 23, 2017 9:27 am

Aripeka Angler wrote:
Wed Nov 22, 2017 9:14 pm
I've not noticed glass telegraphing or printing through the finish on my bright red boat.
It's been sitting completely uncovered in sun for almost a decade.
The paint has however faded noticeably over the last couple of years.
That's good to know. Since I'll be painting with gray this thread has caused some concern. :D

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Re: Dark Color Effect on Epoxy/Plywood?

Post by fallguy1000 » Thu Nov 23, 2017 10:21 am

I found a good article on print through. I will paraphrase.

Hand layup is better than vac or infusion.

Fill coats matter.

The resin matters; polyesters are notoriously bad.

Post curing at temps above environmental is the surest way to avoid it.

Skin coats of veil or csm are used for infusion.

Just for all you guys; I am postcuring my hulls. Not for printthrough, but for fully curing my extra slow S3 epoxy. I have to build a boat oven and heat it to 145F for a few hours.

In the tropics, this is relatively easy. Build a black tarped box and let the sun heat it up. Monitor to avoid overheating or underheating.

Here in Minnesota, I have to hit hot weather in July or August and add heat and hope.

A little scary building a boat oven. If you overheat; you could damage stuff. My tanks are rated to 165F, but Moeller says 170F. If you create a hot spot, say with a bullet heater; you could damage the hull.
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Re: Dark Color Effect on Epoxy/Plywood?

Post by Mike19 » Thu Nov 23, 2017 1:00 pm

Thanks very much guys for the info. I'm constantly learning - much appreciated.
I am building in S. Florida, so lots of heat & sun.
Dark blue hull was my first choice, but white may be better in the long run.

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