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Thread: Polyester resin stays tacky
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31st July 2015, 12:38 PM #1Novice
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Polyester resin stays tacky
As the title suggests, i'm having trouble with polyester resin casting, it stays tacky anywhere it has been in contact with air. I know that it's a "feature" to enable multiple pours to stick together properly but how can i stop it? turning sticky goopy blanks is pretty horrible.
I'm definitely using enough catalyst as the rest of the blank sets hard.
Cheers,
James
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31st July 2015, 12:42 PM #2
Stick it in one of those little ovens for 20-30 mins at about 120C and Bob's your uncle.
Would be one of the most asked (and answered) questions about casting PR.
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31st July 2015, 12:49 PM #3Novice
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Thanks Big Shed, that's the first thing i tried though still as tacky as when it went in. might have to leave it longer. I'll give it a shot tonight.
p.s. anyone know where to get epoxy resin in Aus at a local place? like bunnings, etc. I just want a small quantity to try out and then if it's awesome
i'll order online from amcsupplies or somewhere
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31st July 2015, 01:49 PM #4GOLD MEMBER
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31st July 2015, 03:29 PM #5
Big Shed is on the money on the fix. The cause is usually too much moisture, from cast items or in air, and/or temperature to low.
Neil____________________________________________Every day presents an opportunity to learn something new
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31st July 2015, 07:04 PM #6
Your local boat or fibreglass shop should have at least one or two brands of marine epoxy on the shelves.
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31st July 2015, 07:23 PM #7
You can also avoid the sticky finish by adding wax in styrene to the polyester mix. The wax comes to the surface during the cure process and leaves a stick free finish. The ratio is about 10cc per pint of polyester resin. This is the same process used to convert gelcoat to flowcoat.
steve
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1st August 2015, 01:42 PM #8
i also believe that a layer of glad wrap will also stop it ... i personally use the toaster oven ... it gives a much crisper look to the cast blank
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2nd August 2015, 08:31 AM #9
Oven works for me too. About 100c for 20 minutes is what I do, once cool they are not sticky to touch.
Brad.
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2nd August 2015, 11:40 AM #10
you can also put the heatgun over it for 20-30 seconds.
Don't let it get to hot or it cracks.
but when it cools is just like the rest.
I also use the wax in styrene stuff, that works really well.
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2nd August 2015, 10:26 PM #11Novice
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Thanks guys, a bit longer in the oven did the trick. I did two lots, one at 100c and one at 120c. The 120c resin cracked pretty bad at the edges but was still ok since the blank was a fair bit bigger than it needed to be. The 100c piece was perfect though it was the one that took the extra time in the oven.
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