Need more? Oh ya, need lots more!

What is your opinion on glass cloth verses fabric? I am thinking that most canvas is to heavy. And even with the lighter stuff had better use a thin primer/paint. I am going to use bed sheets for a small fomie project I have going. Am ready to start putting cloth on it. As soon as I get Junk room #1 cleaned enough I can bring the project in from the cold.
Randy