Spraying gelcoat :: Catamaran Sailboats at TheBeachcats.com

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Spraying gelcoat

onekiwi

Rank: Mate

Registered: Oct 24, 2013

Last visit: Jul 22, 2024

Posts: 251
Posted: Feb 10, 2015 - 08:58 AM

Anybody here sprayed gel-coat?We are refurbing the B-lion and got 2 gallons of epoxy swimming pool coating with the boat.I am a bit leary of using the pool paint as I feel it may not harden enough.I was wondering if you could keep layering the gel-coat rather than waiting for it to dry,sand and then apply another coat

Edited by onekiwi on Feb 10, 2015 - 08:59 AM.

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Carl

Dart 18x2
Nacra 5.8
Acat
Windrider Rave x2 for sale
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coolhead

Rank: Mate

Registered: Oct 04, 2013

Last visit: May 23, 2017

Posts: 141
Posted: Feb 10, 2015 - 03:31 PM

As for the gelcoat drying between coat. Buy laminating gelcoat. It won't fully cure and will remain tacky so you will not have to sand between coat. Laminating gelcoat doesn't have wax in it. The polyester resin doesn't fully cure in presence of air. They add wax in it that migrate to the surface making an air barrier so the resin fully cure. Use ordinary gelcoat (with wax) for the last coat. This one will fully cure.

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AB
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gahamby

Rank: Mate

Registered: Feb 05, 2011

Last visit: Jun 15, 2021

Posts: 575
Posted: Feb 10, 2015 - 05:20 PM

Epoxy will chalk out and degrade when exposed to sunlight. If you epoxy your boat you will need to finish it with gel coat or linear polyurethane to achieve any resistance to sunlight.

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'82 Super Cat 15
Hull #315
Virginia
Previously owned: '70 H14, '79 H16, '68 Sailmaster 26, '85 H14T
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onekiwi

Rank: Mate

Registered: Oct 24, 2013

Last visit: Jul 22, 2024

Posts: 251
Posted: Feb 10, 2015 - 06:10 PM

Any ideas on how long the epoxy will take to chalk out

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Carl

Dart 18x2
Nacra 5.8
Acat
Windrider Rave x2 for sale
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jackb

Rank: Mate

Registered: Dec 01, 2011

Last visit: Nov 02, 2016

Posts: 165
Posted: Feb 10, 2015 - 07:35 PM

gahamby If you epoxy your boat you will need to finish it with gel coat

Polyester does't stick well to epoxy. Some argue you can do this, but it is not ideal. I would just use gel-coat as a paint, and not to bother with epoxy.

Here is a good resource on gel-coat

http://www.bottompaintsto…to/how-to-apply-gelcoat/
http://www.fibertek.ca/Bulletins/Gelcoats.pdf

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Jack B
Hobie 17
BC, Canada
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onekiwi

Rank: Mate

Registered: Oct 24, 2013

Last visit: Jul 22, 2024

Posts: 251
Posted: Feb 24, 2015 - 06:17 PM

Went with the epoxy on the deck ,during the last week the temps were up around 80.Rolled it on and let it bake in the shop worked out great,gloss paint always shows you prep flaws!hardened up nicely to be able to sand and recoat a couple of days later.Going to do the hulls tomorrow it is a little cooler so should have more time to finish

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Carl

Dart 18x2
Nacra 5.8
Acat
Windrider Rave x2 for sale
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ericweller

Rank: Lubber

Registered: Sep 24, 2009

Last visit: May 17, 2019

Posts: 96
Posted: Mar 05, 2015 - 11:56 AM

jackb
gahamby If you epoxy your boat you will need to finish it with gel coat

Polyester does't stick well to epoxy. Some argue you can do this, but it is not ideal. I would just use gel-coat as a paint, and not to bother with epoxy.

Here is a good resource on gel-coat

http://www.bottompaintsto…to/how-to-apply-gelcoat/
http://www.fibertek.ca/Bulletins/Gelcoats.pdf

I subscribed to this pearl of wisdom for years when I spray gelcoat but I found a YouTube video that does an excellent job on performing experiments to see if this is true. You can find the video at https://www.youtube.com/watch?v=GwS4YgoGFm8.
Now I am not worried about spraying gelcoat over epoxy repairs.
onekiwi

Rank: Mate

Registered: Oct 24, 2013

Last visit: Jul 22, 2024

Posts: 251
Posted: Mar 12, 2015 - 09:02 AM

Well I did the hulls with the epoxy paint,two coats let it harden for 10 days then color sanded the hulls down to 2000 wet and dry.Looks good going to buff it in a couple of days

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Carl

Dart 18x2
Nacra 5.8
Acat
Windrider Rave x2 for sale
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MN3

Rank: Master Chief

Registered: Jun 20, 2006

Last visit: May 22, 2024

Posts: 7089
Posted: Mar 12, 2015 - 12:17 PM

ericweller
jackb
gahamby If you epoxy your boat you will need to finish it with gel coat

Polyester does't stick well to epoxy. Some argue you can do this, but it is not ideal. I would just use gel-coat as a paint, and not to bother with epoxy.

Here is a good resource on gel-coat

http://www.bottompaintsto…to/how-to-apply-gelcoat/
http://www.fibertek.ca/Bulletins/Gelcoats.pdf

I subscribed to this pearl of wisdom for years when I spray gelcoat but I found a YouTube video that does an excellent job on performing experiments to see if this is true. You can find the video at https://www.youtube.com/watch?v=GwS4YgoGFm8.
Now I am not worried about spraying gelcoat over epoxy repairs.

this video lacks scientifical credibility ;p
MN3

Rank: Master Chief

Registered: Jun 20, 2006

Last visit: May 22, 2024

Posts: 7089
Posted: Mar 12, 2015 - 12:18 PM

any pics?
before and after? or even a few of the process ?

QuoteWell I did the hulls with the epoxy paint,two coats let it harden for 10 days then color sanded the hulls down to 2000 wet and dry.Looks good going to buff it in a couple of days
onekiwi

Rank: Mate

Registered: Oct 24, 2013

Last visit: Jul 22, 2024

Posts: 251
Posted: Mar 12, 2015 - 06:35 PM

Yes i will get some photos up

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Carl

Dart 18x2
Nacra 5.8
Acat
Windrider Rave x2 for sale
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