Avoid this problem by first cutting through the topmost veneer layer with a utility knife, then keeping your cutting tool blade right next to this line. You will not avoid some damage to the reverse face veneer, but that side will usually be hidden from view in the final product.
Cost Effectiveness of Lauan Wood:
Because cost is a major factor in most home renovation projects, lauan wood is perfect choice if your on a budget or just want to save some money. Keep in mind that if you use lauan Wood, and especially for the underlayment of flooring such as Vinyl or Laminate that it's ability to repel mositure is not the greatest, and this can sometimes cause more problems than it's worth.