Today I washed my pants, and re-proofed them with a product for car roofs, the result seems very positive, it remains to check if they keep breathability , but as the legs don't sweat much, and pants have pitzips, it can be a good cheap alternative, must test in real usage.
Dilute the product with water, maybe 1/10 and spray in dry pants, followed by heating again.
Dilute the product with water, maybe 1/10 and spray in dry pants, followed by heating again.