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layup schedule for gutter hatches

Old 07-10-2019, 10:18 AM
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Default layup schedule for gutter hatches

Anyone willing to share what glass they used for hatch gutter layups? I can't seem to find a good description anywhere. I have made some molds and would like to start laying them up. I have plenty epoxy and 5 gallons VE, haven't decided which to use yet. I don't intend to start with gelcoat because I am painting later down the road.

My current thinking was use VE and start with 1.5 csm, and then some bi or triaxials afterward. On hand I have a full roll of 1700, and full rolls of 2400 triax 45/90/45 12" tape, and 2300 0/45/45 10" triax. I know the 1700, without the csm backer, is decent at conforming to curves, etc. Haven't really worked with the 23 or 24, just picked up because it was a good bulk deal.
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Old 07-10-2019, 10:53 AM
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Because you don't talk about the size of the troughs, I can't talk about the thickness that I would work to but has to the material, if I were doing it I'd work with VE, mat ( CSM ), and 18 ounce roving for the greatest thickness per pound... The greatest stiffness per pound as stiffness is what you need.
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Old 07-10-2019, 11:54 AM
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Thanks. Here are some pics. The anchor hatch/receiver I assume will be a little different (more robust)than other two. On the two non anchor hatches, the troughs are a little under 1.75" deep. Raised area where seal goes is 3/4" wide.
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Old 07-10-2019, 01:33 PM
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I'm not sure that I understand exactly what you've got going on there but your spans are small and your corners are tight, you're going to be challenged to do a tidy job with anything but mat and a thin woven material would be the easiest to get to conform, 3/16 of an inch would be the minimum. For the anchor locker I would get closer to a quarter of an inch and a higher glass content (more roll out and a greater percentage of long fibers ) would be more durable.
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Old 07-10-2019, 05:07 PM
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I haven’t mounted them on anything yet for the lip, so to speak. Each will be mounted with 2 inches for lip on all sides and fillet between lip and what you see. Then duratec and sanded and waxed. Maybe pva.

Last edited by Mtwhoosh; 07-10-2019 at 07:00 PM.
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Old 07-11-2019, 10:38 AM
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Originally Posted by Mtwhoosh View Post
I haven’t mounted them on anything yet for the lip, so to speak. Each will be mounted with 2 inches for lip on all sides and fillet between lip and what you see. Then duratec and sanded and waxed. Maybe pva.
That makes sense, you're outside corners are awfully tight.
When you start your laminate go for a single layer of three-quarter ounce mat and let that kickoff and the following layers will go in much easier.
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Old 07-11-2019, 05:03 PM
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I tried making one piece without gel when I made my parts for my project, but ended up chucking it and using gel for the biggest reason that it basically incorporates a built in layer of "fairing gel" into the piece and you can sand out and imperfections. It has prevented me from having to deal with quite a bit of high build primer of those pieces in preparation for paint.
I have relatively little reason scientifically, but I used gel, 2 layers of 1.5oz mat, 4 layers of 1708, and then another layer of mat for all my hatch gutters. On my anchor locker it was basically the same, but I ran some strips of 1708 under the ends of the gutters for the anchor figuring they would take the most abuse.
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Old 07-11-2019, 06:31 PM
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Thanks for the gelcoat tip. Always great info on THT
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