I'm sure some can build red oak boards with fiber glass backings, just like some can build red oak bows with bamboo backings but for me it isn't worth the possible frustration and I would think it would be discouraging to a new bow builder. FG tape is OK also I guess but just because it has FG in it doesn't necessarily make it the optimal backing material. With the right board, no backing is needed. If you want to add a simple backing for insurance reasons, linen, silk or even brown grocery bag make excellent backing materials with little or no expense if you have TiteBond glue on hand. Once the TB and material(cloth or paper) combo cure it makes a very strong but somewhat flexible backing. Like glass cloth and resin these combos become as one and will give you the protection you need without overpowering the belly. Pat