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Hot coat hints and tips

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Matthijs94
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Re: Hot coat hints and tips

Postby Matthijs94 » Thu Apr 01, 2021 4:16 pm

I did not prepped the surface before putting the hot coat on. Straight onto the carbon which I vacuumed last week. I only sanded the rails, where there was a carbon overlap. Cleaned the board with a vacuum cleaner, compressed air and dust remove spray. 100% sure that the board was totally clean. The epoxy shop told me to sand the layer down a tiny bit and put another layer over, 'won't be a problem.' Not sure what to do now. I still have to do the top side, how should I prep it to prevent the same?

My feeling is a combination between the resin being super viscous, wrong prepped surface and painted areas with uneven surface.

It's a journey to find the right materials and methods. I was pretty happy with the results for a first carbon vacuum build so far, bummer to get the last step wrong.

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downunder
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Re: Hot coat hints and tips

Postby downunder » Thu Apr 01, 2021 4:38 pm

The finish is the most time consuming.

People underestimate this. What I would do is sand off completely. Level it.

Than spray with PU varnish. The wooden boat finish we all love is many, many PU layers. Gold Spar International Gloss marine type.

Nothing beats it. See this? Mirror shine, sprayed PU


viewtopic.php?f=107&t=2382042&p=890031& ... ld#p890031

longwhitecloud
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Re: Hot coat hints and tips

Postby longwhitecloud » Fri Apr 02, 2021 12:39 am

some people actually use polyester resin as a hot coat too on epoxy.

did you use peel ply?

Matthijs94
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Re: Hot coat hints and tips

Postby Matthijs94 » Fri Apr 02, 2021 7:22 am

I truly underestimated it. Positive side, it gives me a new reason to build another board. This building thing got me addicted.
@Downunder, thanks for the advise, will give it a go this weekend.
@longwhitecloud, yes I used peelply/breather/vacuumbag. Because the peelply gives a 'rough' surface, I assumed no preparation was needed for the hot coat.

handy
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Re: Hot coat hints and tips

Postby handy » Fri Apr 02, 2021 10:15 am

i put topcoats on pretty easy,
fresh sanded board (80 grit) cleaned with DNA.
Tape of the rails clean again with DNA, put on topcoat with a foam brush, no degasing, no crap ,
just the right resin , Sicomin EVO with fast hardener, never have problems , when having falling temps in your glassing room or a colder board.
Thats how a topcoat looks before sanding and polishing
20210331_115321-(002).jpg


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