I have used the spray with pins but have stopped using it. Although they say it washes out I found this not to be true. Had to re-pin a quilt because the person who helped(?) me was in a rush to use the table and made quite a mess.
I removed all the pins and tried washing the spray out, not only was batting very sticky but front & back of quilt were also. The only way I could iron them was to use my applique mat.