Stiffen foam brushes for better results
I like the convenience of disposable foam brushes but find that the foam becomes too flexible after soaking in finish for a few minutes. To remedy that situation, sandwich the foam between two pieces of hardboard held together with tape hinges. As you lay down the finish, apply finger pressure to stiffen the foam as necessary. You'll get better flow control, fewer bubbles and streaks, and more life out of every brush.
—Joe Carretto, Corsicana, Texas