Spontaneous combustion is a serious problem with almost any oil soaked cloth . I once saw a guy open up his new linseed oil soaked canvas sheet to show every one , the thing gave off a puff of smoke and burst into flames as the air ,oxygen , got to it . I have seen oil soaked rags thrown in a drum, almost burn down a workshop and a cloth used to mop up some mutton fat from a barbeque get so hot it melted the plastic bucket it had been placed in . My advice is dont make one , and if you do keep it stored unrolled and out of the house or garage .
I got around the problem by buying a sheet of brown oiled Japara , commonly known as oilskin , sewing leather loops on the corners and one in the top center . This may not be historically correct and may cost more but it is safer and doesn't get sticky in the sun or take years to loose it's smell.
Small stones also work as corner ties and are free and historically correct .