More resin in lines?

This is my first post but I have read on the forum for a year

Okay my question

I will make a roof for a bmw e90 is about 1.5 square meters

I made the mistake and ordered fast hardener do you think it will work?

Will it work with one resin inline or will I need more inlines?

If I need more lines how will I lie it down?

Or has anyone any other suggestions?