Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Call emergency services now if there is:
Trouble breathing, severe wheezing, or blue or grey lips
Collapse, seizure, confusion, or difficulty waking
Severe chest or abdominal pain
Drooling or inability to swallow
Vomiting blood
Sudden or continuing loss of vision
A large or deep chemical burn
Exposure in a confined space with more than one affected person
And for anyone, someone who:
you believe has taken an overdose or swallowed something poisonous
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
2
Is any of this happening?
Be seen today
Contact a poison centre promptly after swallowing any amount of uncured resin or hardener.
Also seek advice after a significant inhalation, an eye splash, or skin contact with a corrosive product.
Do not wait for symptoms before calling.
3
Does any of this apply?
Book an appointment
Arrange routine medical follow-up if a rash, cough, wheeze, eye discomfort, or swallowing problem continues after initial first aid.
Follow-up is also important if symptoms repeatedly return during resin work.
The article also says
Do not enter a room with concentrated fumes to rescue someone unless it is safe and you have appropriate protective equipment.
Every sign above is quoted from the sofidex article on Plastic casting resin poisoning. If you are not sure, err upward — it is always reasonable to be checked.