Resin

A forum for discussing boat or trailer repairs or modifications that you have made or are considering.

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warfin
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Resin

Post by warfin » Sun Feb 10, 2019 12:06 am

I am undertaking some minor repairs on my X and my specialist adviser has suggested I ask the following question:
Is the Mac X constructed using EPOXY or POLYESTER resin?
I respectfully ask for a simple answer. Thanks.

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NiceAft
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Re: Resin

Post by NiceAft » Sun Feb 10, 2019 7:10 am

Have you tried calling Blue Water Yachts? (206) 282-4261 They are the experts when it comes to most things about MacGregor sailboats.

Ray

Stevenhigbee
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Re: Resin

Post by Stevenhigbee » Sun Feb 10, 2019 6:43 pm

Given Roger's emphasis on maximizing value, it seems highly probable that the resin is polyester, since epoxy is much more expensive.

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yukonbob
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Re: Resin

Post by yukonbob » Sun Feb 10, 2019 11:35 pm

Doesn’t matter what the boat is made from, use epoxy. Poly won’t make a good bond (it will fail after a few years) vinyl works a little bit better but epoxy is the only thing you should be using when adding onto cured resin, no matter the composition. Use a thickener like coloidial silica for strength, build and less sag. Other additives have different characteristic, if in doubt buy west systems and use their system to determine what you need. It is pricey but fairly cool proof. Also recommend using a catalyst without blush to avoid the washing between coats or applying finish.

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yukonbob
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Re: Resin

Post by yukonbob » Sun Feb 10, 2019 11:36 pm

And yes the Macs as polyester.

1st Sail
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Re: Resin

Post by 1st Sail » Sun Feb 10, 2019 11:52 pm

Want to see what you can do with resins? Check out this site. This couple have been rebuilding their Cat for a couple of years. check out the interior salon and head rebuilds.

warfin
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Re: Resin

Post by warfin » Mon Feb 11, 2019 12:10 pm

Thanks everyone for your replies.
We will go with epoxy.

1st Sail
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Re: Resin

Post by 1st Sail » Mon Feb 11, 2019 7:52 pm

Another senior moment. Here's the url: https://www.youtube.com/channel/UCoxPH3 ... J2A/videos
A lot of excellent videos working with West systems epoxy in variety of applications.

warfin
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Re: Resin

Post by warfin » Wed Feb 13, 2019 4:29 pm

An excellent video. Well produced. Thanks 1st Sail.

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Spector
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Re: Resin

Post by Spector » Thu Feb 14, 2019 7:07 pm

This my go to for fiberglass info
https://www.youtube.com/user/boatworkstoday

His most recent video discusses poly vs epoxy.

Duquette5
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Re: Resin

Post by Duquette5 » Fri Feb 15, 2019 2:02 pm

Love his videos! He takes the time to explain the process and does a great job!
Spector wrote:This my go to for fiberglass info
https://www.youtube.com/user/boatworkstoday

His most recent video discusses poly vs epoxy.

warfin
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Re: Resin

Post by warfin » Sun Feb 17, 2019 2:40 pm

After being advised by BWY the construction (everything) is by ployester resin and after further discussion with my specialist advisor ( an aerospace composits engineer), I will be using the poly system for my current repairs.
Progress of the work will be posted.
The boatworkstoday youtube comparison poly vs epoxy is informative. Thanks.

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yukonbob
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Re: Resin

Post by yukonbob » Sun Feb 17, 2019 8:18 pm

If your project is structural I would get a new ’specialist’, if it’s cosmetic or a new build that get mechanically fastened consider poly or vinyl.

http://www.boatus.com/boattech/casey/polyster-epoxy.asp

warfin
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Re: Resin

Post by warfin » Tue Feb 19, 2019 1:57 pm

Yukonbob that is exactly what I am doing.

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yukonbob
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Re: Resin

Post by yukonbob » Tue Feb 19, 2019 3:57 pm

Bolt on or Cosmetic?

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