apron questions

[velociraptorx.livejournal.com]

Hey ladies/gents.
I have a couple of questions about making an apron [which is going to be my weekend craft this weekend. +squee+ I've waited 2 weeks for it!] Anyways, I have some pretty good quality cotton fabric [quilting cotton as I've been told it is called] I was wondering if I should use interfacing [fusible] on the underside of the apron to make it more sturdy or if the cotton is good enough? I have medium weight fusible interfacing if I need to use it. =o) I can. I have enough for the apron - Ihave light weight too but I only have half as much as I need. =o\

Also, I want it to be waterproof [since I plan on wearing it when I wash dishes because that is a huge watery mess when I do dishes. =o\] and I have scotchgaurd heavy duty water repellent [for outdoor fabrics]. Can I use this? If so, should I put it on before or after I preshrink the fabric??? [I was waiting to wash the fabric to know if I should put it on before hand. =o\]

Thank you for any/all help everyone gave me and for all the extensive & very welcomed advice I was givin via dietcokefiend. It was greatly appreciated and I DID invest in some new sewingmachine needles & some higher quality thread [thank goodness hancock was having a huge 50% off sale - so I basically bought 1 & got another free!] <3