Carbon sticking to gelcoat


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Carbonphoenix
Carbonphoenix
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Hey all, 

Been having problems,
One of my staff has been laying up some new moulds (vinylester tooling), and despite post cure and 10 waxes, the prepreg is sticking badly.
So much so, that we have to break the part to save the tooling, to the point of literally ripping it out.

What the hell is the issue?
over cooked? tooling not post cured enough?

Pics attached for reference


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Carbonphoenix
Carbonphoenix
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Hanaldo - 12/3/2020 2:20:08 AM
Is it a high temperature wax? And if it is, can it actually handle the temperature you are curing at? Lots of 'high temperature' release waxes are really only designed to handle higher exotherm temperatures, which aren't really that high - often only 80-100° C. I think the highest I have come across is 115°. 


It's supposed to be. 
We have been using it on other mouldings and had been fine 'marbocoat 290'.
I haven't checked the  data sheet ref temperatures, but will have a gander.
Was concerned if my oven is out of calibration and is putting in way too much heat

Carbonphoenix
Carbonphoenix
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Carbonphoenix - 12/3/2020 3:18:19 AM
Hanaldo - 12/3/2020 2:20:08 AM
Is it a high temperature wax? And if it is, can it actually handle the temperature you are curing at? Lots of 'high temperature' release waxes are really only designed to handle higher exotherm temperatures, which aren't really that high - often only 80-100° C. I think the highest I have come across is 115°. 


It's supposed to be. 
We have been using it on other mouldings and had been fine 'marbocoat 290'.
I haven't checked the  data sheet ref temperatures, but will have a gander.
Was concerned if my oven is out of calibration and is putting in way too much heat



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