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Ever lay some 'glass? (Fibreglass)
Posted by: mrbigstuff
Date: October 24, 2021 07:37PM
I've got to do some repairs to a boat, and have never done this work, although I've done some auto bodywork.

Lots of videos (thousands it would seem...) but always looking for the opinions of the MRF masses.

What do you think of certain types of mat? 1708 seems to be what some use, but I'm just familiarising myself with the terminology. Has to hold/repel water ;)
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Re: Ever lay some 'glass? (Fibreglass)
Posted by: Rolando
Date: October 24, 2021 10:04PM
Only the pink insulation




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Re: Ever lay some 'glass? (Fibreglass)
Posted by: rgG
Date: October 25, 2021 08:23AM
I did a small fiberglass repair on the hull of a catamaran a long time ago. Small hole/gouge that needed to be repaired.
WEAR GLOVES!
The epoxy stuff you imbed into the glass mat is NASTY and you don’t want it getting on your skin.
The repair wasn’t really hard, IIRC, but it was stinky and a little messy.
Do it outside, if at all possible. It really stinks.





Roswell, GA (Atlanta suburb)
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Re: Ever lay some 'glass? (Fibreglass)
Posted by: cbelt3
Date: October 25, 2021 09:05AM
I did a bunch of glassing on a *classified* thingy outdoors at Edwards AFB many decades ago. Gloves, gloves, gloves. Prep the surface so you have good adhesion zones. Mix carefully. soak the mat and smooth it down. Wear clothes you are willing to lose. And wear a respirator when you sand it. You WILL have to sand it and smooth it and re-coat it.

I amusingly once glassed up the gas cap area on my daughter in law's Malibu. The rest of the car rusted into nothingness, but that glassed area stayed intact...
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Re: Ever lay some 'glass? (Fibreglass)
Posted by: MrNoBody
Date: October 25, 2021 09:35AM
Long time since I've done glassing/gel coating. I'll parrot the above advice:
Gloves, heavy duty nitrile not the cheap ones.
Respirator, just not for sanding.
Eye protection.
Acetone
Disposable plastic mixing containers & wood mixing sticks.
Patience and lots of it!

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Re: Ever lay some 'glass? (Fibreglass)
Posted by: ztirffritz
Date: October 25, 2021 09:43AM
I work in a composites shop. I make hoods and roofs for Kenworth and Daimler trucks, front and rears for Gillig buses, military troop carrier covers for LMTV and HMV, and aero caps for large RV trailers. I can tell you that you do need to use a special gelcoat or else it will quickly degrade and leak. I don't do boat work here, so I can't provide much guidance, but I know that the consumer go-to source is Total Boat.

[www.totalboat.com]

They can supply you with most anything that you'll need. They have many videos on YouTube as well. Get a good supply of dust masks, and rubber gloves and garbage bags. You're going to generate an enormous amount of waste material. If you live in California you're probably not even allowed to attempt this.



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Re: Ever lay some 'glass? (Fibreglass)
Posted by: Paul F.
Date: October 25, 2021 10:49AM
Quote

Get a good supply of dust masks, and rubber gloves and garbage bags. You're going to generate an enormous amount of waste material.


This is a fact... Everything you touch once you start the "wetting things with epoxy" stage is going to become covered in epoxy, and needs to go in that garbage bag. If it gets all over your gloves, shuck the gloves into the trash, and re-glove. Wear a tyvek coverall so it can be shucked into the trash.

Quote

If you live in California you're probably not even allowed to attempt this.

Just go to Arizona/Nevada/Oregon to pick up the supplies and don't pay any attention to California laws. No other hobbiests I know do. Makes it damn hard to get some solvents you can't do without for some things, though.



Paul F.
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Edited 1 time(s). Last edit at 10/25/2021 10:50AM by Paul F..
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Re: Ever lay some 'glass? (Fibreglass)
Posted by: NewtonMP2100
Date: October 25, 2021 02:22PM
....only good a laying pipe.....



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