Good question KL4D4, i´ve tried the first method and it worked fine, i´m trying the second method now but insted of using a plastic bag i´m using a tupperware box...

1st were Grapefruit 10 seeds - all germinated 8 of them were females

2nd Haze 19 x Skunk 10 seeds - i only have 4 in the tupperware box i´ll let u know in a day or two the outcome