Many threads on here about seasoning ya canvas when new
Central Coast Campers use Good Aussie Dynaproof Canvas so no hassles with quality
Basically put it up in the back yard and if u can leave it there...hose it down...i mean really wet that sucker till water comes in thru the seams and wet it some more
Then let the sun dry it out,u may need to be nearby as as it drys it will shrink a bit and u may need to adjust your bows etc
All dry.....Do it all again....then again.....
Or the best way..JUST GO OUT AND USE IT........ if it leaks in a storm....MEH!
We seasoned ours in the yard for a bit then took it out camping... flogged down one night...leaked a little....flogged down a few days later....dry as
Just make sure when u pack up its dry..... or if u cant dry it put it back up at home to dry within a few days or u will get mould