I THINK the amonia breaks down the moleular bonding in the wood a little more than water, water just opens the grain. Not enough to cause serious harm. Wet or soak the wood and form it over the area to be covered. Use tape or bubber bands or even weights to hold it in place while drying. Let dry completely before attempting to glue. Letting it dry in place lets the wood form a "memory" of the desired contours. Makes gluing easier later.