my 105 epoxy resin... slit my throat - SailNet Community

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Old 08-26-2010
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my 105 epoxy resin... slit my throat

so i folded like a lawn chair and bought the 105 and all its goodness with it. take it home- apply with a slow hardener, its been damn near 24 hours and its still tacky... wtf is going on here, the boat is outside- low was 75 last night and its been near 100 degrees all day. I mixed the hardener just as it told me too. what im afraid of now is that i have coated all this crap and now its gonna be near impossible to get off. any suggestions here
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Old 08-26-2010
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any suggestions here
Patience. Give it time.
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Old 08-26-2010
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5 to 1 mix right? Mixed it real good?
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Old 08-26-2010
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Did you use the right pumps? sometimes people get the wrong pumps and the mix is off.

Pot life at 72°F (22°C): 20 to 25 minutes
Cure to a solid state: 10 to 15 hours
Cure to maximum strength: 1 to 4 days
Minimum recommended temperature: 60°F (16°C)

what did you use it on? paint under it will make it stay tacky forever.
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the area of the fix is clean- there were some drips lower onto some bottom paint- so whats the fix once it gets on paint?
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Old 08-26-2010
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first as for drips let it cure then scrape it gently, it will take some paint with it.

as for the cure try a hair dryer on it, although at 100 degrees it should have cured. You could take and add a thin layer over the tacky stuff with a little mixed resin with fast hardner. some will say no, but you can try a small area and see what happens. as for the pumps i hate them, almost every set of pumps i have bought where off. i use measured mixing cups, add 5 oz of resin one of hardner then mix. sense using measure cups i have never had a problem but i did lots of times with the pumps.
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Old 08-26-2010
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ditto on the problem with pumps. I also usually 'purge' each pump a bit before I take a metered amount.

Also, I use a 2 cup system to mix to ensure thorough mixing of the hardner and resin: Meter to the first cup and mix; then pour the first cup to a second cup and continue the mix --- seems to get a more consistent mix that way and avoids having an inconsistent mix of hardner/resin if you use only one cup.

As regards your thin slow curing layup, definitely increase the surface temp to accelerate the cure; for every 20 deg. C increase you 'double' the cure time rate.
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Old 08-27-2010
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I don't do pumps as i work in a filling plant and see many bad ones

I use mix and measure cups and after 4 gallons so far its all kicked


What harder # as even slow should be hard by now ,i have found the medium to be a good all around one

Acetone and paper towels will clean it up with a bunch of caution
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If a dirty bottom slows you down what do you think it does to your boat
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Old 08-27-2010
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It's pretty obvious that the epoxy resin to hardener mix was wrong, for whatever reason. In temps above 75˚, getting a decent working time, even with slow hardener is difficult. Personally, I think West Systems epoxy is over-rated and over-priced. I generally recommend and use epoxy from Progressive Epoxy Polymers in NH: epoxyproducts.com. Paul knows his stuff.

Like Tommays, I don't use mixing pumps... they're convenient but can often give you the wrong ratios, especially the initial few pump strokes.
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I never go by volume for epoxy, I weigh the components. Pumping just wastes valuable time, and is prone to errors. When weighing materials, read the directions, because the specific gravity of the two components may differ. I do believe West is a 5:1 mix both by volume, and weight. System three, however, is a 2:1 mix by volume, but only 44% by weight.
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