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Hatch gutter molds/rebuild/conversion thread

Old 06-30-2019, 04:09 PM
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Default Hatch gutter molds/rebuild/conversion thread

Took a shot at some mdf molds over the weekend. Large squareish bilge, fish box and anchor hatch. The basic method I used was two half inch mdf pieces epoxied together then 3/4 mdf piece cut out with jig saw on top of that. Then glue .5 mdf piece of similar curve (smaller, leaving 3/4 gap all around). Roundover bit on every free edge and the drum sander helps to round the high outside corners. Jointer is great tool to square up the whole lot before rounding over.

So these (bilge and fishbox) will have approx 1.75 deep
gutter) more like 1-5/8) big corners and 7/8-1 for core on hatch.

I used total boat fairing compound for fillets. Still need to sand the two green ones. Cant decide whether to put them on mdf to just make gutters or make another fishbox one to layup the whole aft deck. I will put the anchor hatch on a board.

Last edited by Mtwhoosh; 08-10-2019 at 12:51 PM.
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Old 07-18-2019, 08:34 AM
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What stage are you at now, id love to see more pics, going to be starting my deck layout soon and make my own gutter/hatches too.
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Old 07-18-2019, 03:13 PM
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2-1 coosa pieces

Used some of the old glass I took off to fill out drive holes after bonding coosa

Fillets
Well...stalled a bit on the hatches. Working on bigger issues like transom, etc, on the bigger project.
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Old 07-19-2019, 06:34 AM
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Keep posting!!! we love build threads!!
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Old 07-20-2019, 04:42 PM
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Old 07-26-2019, 05:07 AM
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Default Lowes fence post foam

been experimenting with getting old motor mount areas on box stringers level with rest of box stringer so I can maximize use of expensive coosa. I bought some fence post foam from Lowes. Its two part urethane foam about 2-3 lbs density just like us composites foam so should be able to glass over. I cut some 1/4 ply, taped if with gorilla tape and screwed it to the stringers. Poured then cut with Japanese hand saw. Will sand down and round over and cover with 6-8 layers of glass. Probably use 4-6 layers 1700, then two 2400 triax and epoxy. Heres a pic. Was a little messy but not too bad.
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Old 07-26-2019, 06:06 AM
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Default Transom sides



also been pondering what to do with the parts of transom to the sides of the center. They are not really curved, just angle in about 10 degrees from middle flat area. I pondered building a dam and pouring arjay but got worried about epoxy compatibility due to nearby glass, hole I filled and fillets, all in epoxy. So I just put a piece of coosa in with thickened epoxy. Probably could have just glassed but this will make glassing the transom easier and eliminate/reduce a right angle. Here is a really bad pic. I worry a little about a hard spot or other weirdness at the joint but welcome any thoughts.
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Old 08-09-2019, 09:39 PM
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6 layers 1700, just under 3 gallons epoxy


Used a 7/8 roundover on the core and the glass laid down fine
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Old 08-10-2019, 12:53 PM
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Better pics-my helper in background
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