Finding the reason for glue line failure
Q. We have just had two panels of cedar with glue line failure. Normally, we have excellent results. We are using a two-part cross-linking PVA emulsion adhesive with a catalyst. We are checking the glue edges for squareness and flatness; we are positive that we have a good, even glue spread; we are keeping the open time to less than ten minutes; we are making sure we have a four-hour clamp time; and we do not machine for 24 hours. Our press has manual pressure. What should we be looking for?