Thanks, not a siringe but a real thin plastic applicator. The problem is towards the top and bottom it was still very tight, and I believe not enough weldon was pulled in those areas. I also ran a bead of weldon 16 in the inside edge. I should have just used the rod, but instead I applied silicone made especially for acrylic. I just want to do exactly what the builder suggests in the case that I'm not able to fix it, that he'll either replace or repair it himself. Thanks though from what I've read the rod it the best method, especially in an unseen corner.