sanding the corners of parts

hello friends,
i need your help , as i ve a problem with sanding the part edges. while sanding the fibres of edges get totaly exposed . so i need to apply again primer over it. so please help me in getaway from this thread...kindly extend your valuable suggestions.

thanks

SIVA

 

how thick of fabric are you using? and how wet do you get it when you lay it up?

 

Another way to seal part edges is to apply a small amount of 5 minute epoxy to a rag and then swipe the edge of the part. Works really well.