When I built our 9m Sharpie using WEST and Systhem Three, I started sheeting the flat bottom on an cold early winter morning. The shop poorly heated and so a window only half open ...
Had to see my doctor for some testing and stopped working for a year. After upgrading my tools, protection and working habits, I finished the project step by step over a period of 10 years using standard epoxy made by Sicomin.

Maybe you have a look into the new Greenpoxy resins manufactured in France by Sicomin.com. On their website they say:
For the Greenpoxy epoxy resin 30-50% of the carbon is obtained from plant components, the CO2 emission is reduced to approx. 40% and there is 60% less toxicity for humans

On the website of my German supplier (timeout.de) I found a 11 page pdf file: https://www.timeout.de/pdf/SR_GREENPOXY_56_FDS_DE.pdf

although the text is in German, you will certainly understand the following:

BISPHENOL-A-EPICHLORHYDRINHARZE
Reizwirkung auf die Haut, Kategorie 2 (Skin Irrit. 2, H315).
Augenreizung, Kategorie 2 (Eye Irrit. 2, H319).
Sensibilisierung der Haut, Kategorie 1 (Skin Sens. 1, H317).

'... the nature of the materials require safe handling and an awareness of the appropriate safety procedures. Materials Safety Data Sheets are available for each hazardous product and can be supplied by Sicomin on request.'

After 8 years living aboard I nowadays use cheap epoxy from the hardware store nearby. 2:1 for ease of mixing, always wear glasses, fresh gloves (nitril) and work in the open cockpit. Same with 2part polyurethan.

Leo
sv/tara

Based purely on personal experience, I'd say it varies from brand to brand....