The yellower the hardener, the more likely your resin is to cure with a yellow tint. Some resins are more prone to this than others. My suggestion is to only purchase enough resin that you can comfortably use within 6 months.
As for the vent, it depends on the kind of resin you are using. With epoxy resin, that is probably sufficient. Other resins require safety respirators. If youre unsure, I would suggest checking with the manufacturer for their recommendations.
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