Actually using spider webs as well as silk too coagulate wounds is historically known as well as medically proven.
Mongolian warriors would wear multiple layers of shirts made of silk so when they would get shot with an arrow they would just pull the arrow including the arrowhead and Barb straight out of their body. The innermost layers of silk shirt would actually stay inside the body and coagulate the wound.
So absolutely there is a huge amount of knowledge that we need to start stockpiling away and become aware of because here very soon we are all going to need exactly that information.
Especially when you do not have any access to the internet.