double bias handling

[tropicalbuilder]

Hi, I'm new using double bias (DBM 1708)
so as I use to do with mat and roving, I measure my patches ,dry fit them, and carefully roll them .... but with DBM at the moment af the layup I found that they have distorted and dont'fit any more...
any secret tip on how to handle this material without losing the shape?

[geppeto]

Wet them out on polythene sheet, trim the edges and fit the patch into place, then remove the plastic. A light weight flexible polythene is best (75-125 microns)

[Herman]

If you do not need the drapability, you could also opt for stabilised DB. This has a small amount of 90 degree fibers, which prevent it from changing shape.

[War Whoop]

Originally Posted by tropicalbuilder

Hi, I'm new using double bias (DBM 1708)
so as I use to do with mat and roving, I measure my patches ,dry fit them, and carefully roll them .... but with DBM at the moment af the layup I found that they have distorted and dont'fit any more...
any secret tip on how to handle this material without losing the shape?

Some of these materials, I have found do not like being cut off from the end of the roll but work better when cut with the length.

[tunnels]

Use double bias with the 125 gram csm on the back it hold together no sweat . Also comes withA 225 gram csm as well