UHMD boat bottom?

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Danny R
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UHMD boat bottom?

Post by Danny R » Sun Apr 16, 2017 10:05 am

I am building a 14' wooden drift boat first boat build my ? Is if I put a UHMD boat bottom on do l still need to fiber glass boat?

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Re: UHMD boat bottom?

Post by garrech » Sun Apr 16, 2017 6:45 pm

May be a dumb question, but what is UHMD?

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Re: UHMD boat bottom?

Post by DrBryanJ » Sun Apr 16, 2017 7:24 pm

Why do you want to use uhmd? From what I see a 1/4" 4X8 sheet is around $400. That's way more than wood.

garrech: I may be wrong, but UHMD is ultra high molecular density plastic

Last edited by DrBryanJ on Sun Apr 16, 2017 7:27 pm, edited 1 time in total.

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Re: UHMD boat bottom?

Post by JimmY » Sun Apr 16, 2017 7:27 pm

Ultra High Molecular Density, duh! :D

I doubt you could get fiberglass and epoxy to stick to UHMD.

Glassing is typically used for abrasion resistance, which is probably why you are looking at UHMD, so probably not.
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Re: UHMD boat bottom?

Post by rleete » Mon Apr 17, 2017 5:04 am

The only UHMD plastics available in sheets (polypropylene or polyethylene) will not stick to much of anything. They need to be welded using heat or some pretty nasty solvents. Not something I'd want to attempt in a home shop.

There is no way any epoxy is going to stick, and there is no way to glue it to the bottom - it must be mechanically fastened. That's going to leave holes which can not be sealed, as sealants won't stick, either.

Probably not a really good idea.

BTW, industry accepted terminology is either UHMW (ultra high molecular weight) or UHD (ultra high density). Different types of plastic, generally. At my company we use Polypro to make large plating tanks which hold nickel sulfamate for electroplating optical tooling.

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