Epoxy gummy and bit sticky

Talk Composites - The Forum for Advanced Composites

Back

Epoxy gummy and bit sticky

Author	Message
Davi211	D Davi211 posted 6 Years Ago Topic Details
D Group: Forum Members Posts: 3, Visits: 8	Hello, I'm a first timer with epoxy and I was really careful on the dosage and how long I would mix the resin, I also never mixed more than 300ml at the time. Now it has cured for around 15 hours but it still feels gummy and it deformed easily if pressed. For some reason I thought that 15 hours would already provide a hard surface, am I wrong? I hope so as otherwise could be something much worst : ( I try to keep the room temperature around 24 degrees it might have gone down a bit during the night Any idea what could it be? Full of hope looking forward to any help Davide
	Reply Like 1
oekmont	oekmont posted 6 Years Ago HOT Post Details
Group: Forum Members Posts: 550, Visits: 27K	Epoxy usually reacts much slower than polyester (if you are used to that). Most epoxys could be still gummi after 15h at room temperature and below. This is nothing to worry about. If it's still not cured after 48h, than you should start checking for mixing mistakes.
	Reply Like 2
Matt (Staff)	Matt (Staff) posted 6 Years Ago Post Details
Group: Forum Members Posts: 680, Visits: 1.9K	+x Davi211 - 9/24/2018 11:00:45 AM Hello, I'm a first timer with epoxy and I was really careful on the dosage and how long I would mix the resin, I also never mixed more than 300ml at the time. Now it has cured for around 15 hours but it still feels gummy and it deformed easily if pressed. For some reason I thought that 15 hours would already provide a hard surface, am I wrong? I hope so as otherwise could be something much worst : ( I try to keep the room temperature around 24 degrees it might have gone down a bit during the night Any idea what could it be? Full of hope looking forward to any help Davide Hi Davide, As Oakmont has suggested, epoxies may well be slower than other resins you're used to and so this is probably nothing to worry about. Assuming it's one of our resins you're using please tell me which resin it is and I would be happy to give you a bit more information on the typical cure time. Matt Statham Easy Composites / Carbon Mods - Technical Sales
	Reply Like 1
Davi211	D Davi211 posted 6 Years Ago Post Details
D Group: Forum Members Posts: 3, Visits: 8	+x Matt (Staff) - 9/24/2018 12:36:07 PM Hi Davide, As Oakmont has suggested, epoxies may well be slower than other resins you're used to and so this is probably nothing to worry about. Assuming it's one of our resins you're using please tell me which resin it is and I would be happy to give you a bit more information on the typical cure time. This is my first experience with resin in general so I don't have mean of comparison besides internet info. I got GlassCast 10/50 Thanks
	Reply Like 1
Matt (Staff)	Matt (Staff) posted 6 Years Ago Post Details
Group: Forum Members Posts: 680, Visits: 1.9K	+x Davi211 - 9/24/2018 1:10:43 PM +x Matt (Staff) - 9/24/2018 12:36:07 PM Hi Davide, As Oakmont has suggested, epoxies may well be slower than other resins you're used to and so this is probably nothing to worry about. Assuming it's one of our resins you're using please tell me which resin it is and I would be happy to give you a bit more information on the typical cure time. This is my first experience with resin in general so I don't have mean of comparison besides internet info. I got GlassCast 10/50 Thanks Ahh, then yes, it would be perfectly normal for the resin to be sticky after 15hrs. Because GlassCast 50 is designed for thick section castings it needs to be very slow curing. Otherwise it would overheat during its cure in a situation we call an 'exotherm'. GlassCast 50 will take around 48hrs to cure at 20'C, you should also account for what the ambient temperature drops to during the evening because the time it takes for the resin to cure will depend on the cumulative time and temperature over the whole day and night period; if the temperature dropped to 10 degrees at night for example then this would barely count towards the cure time. So, for this project, just keep the place warm and leave it for a good while yet! Matt Statham Easy Composites / Carbon Mods - Technical Sales
	Reply Like 1
Davi211	D Davi211 posted 6 Years Ago Post Details
D Group: Forum Members Posts: 3, Visits: 8	+x Matt (Staff) - 9/24/2018 2:02:15 PM Ahh, then yes, it would be perfectly normal for the resin to be sticky after 15hrs. Because GlassCast 50 is designed for thick section castings it needs to be very slow curing. Otherwise it would overheat during its cure in a situation we call an 'exotherm'. GlassCast 50 will take around 48hrs to cure at 20'C, you should also account for what the ambient temperature drops to during the evening because the time it takes for the resin to cure will depend on the cumulative time and temperature over the whole day and night period; if the temperature dropped to 10 degrees at night for example then this would barely count towards the cure time. So, for this project, just keep the place warm and leave it for a good while yet! You just made my day, so happy. Thanks a lot.
	Reply Like 1