The Rostock MAX V2 manual says " it takes 24 hours for the RTV to set fully". I waited 24 hours and applied power. Vapor or smoke started coming from the resistor cavity. I removed power and checked the resistor cavity and it seems that the RTV has only "set" on the outside. It has been 36 hours now and it seems the RTV inside of the resistor cavity is still very pasty, not cured.
Am I doing something wrong or will it actually take much longer than 24 hours to cure?
Red RTV silicone cure time
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barry99705
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Re: Red RTV silicone cure time
It can take longer if it's cooler where your hot end is sitting.hcdbey wrote:The Rostock MAX V2 manual says " it takes 24 hours for the RTV to set fully". I waited 24 hours and applied power. Vapor or smoke started coming from the resistor cavity. I removed power and checked the resistor cavity and it seems that the RTV has only "set" on the outside. It has been 36 hours now and it seems the RTV inside of the resistor cavity is still very pasty, not cured.
Am I doing something wrong or will it actually take much longer than 24 hours to cure?
Never do anything you don't want to have to explain to the paramedics.
Re: Red RTV silicone cure time
I am in a warm part of Africa where the room temperature for the printer is around 75 degrees. Any idea how much longer? Could it be several days longer?
Re: Red RTV silicone cure time
Did you use Permatex Ultra Copper High Temp RTV?
Re: Red RTV silicone cure time
Yes, I used Permatex Ultra Copper High Temp RTV. It seems like it has skinned over to a depth of a few millimeters and that skin is keeping the internal Permatex from solidifying. The other question is the age of the RTV I am using. It is at least three years old. It seems to flow easily and doesn't appear to be too old but then again, I am not an RTV expert.
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ccavanaugh
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Re: Red RTV silicone cure time
I've cheated by letting it skin over for a couple of hours and then setting the hot end heat to about 80C for about 6 hours. I've applied kapton tape to the exterior for extra insulation and protection against the thermistor popping out and causing a melt down.
I've not had any issue with this approach and it has not appeared to impact reliability. It does give off a an odor for a bit until it fully cures.
I've not had any issue with this approach and it has not appeared to impact reliability. It does give off a an odor for a bit until it fully cures.