Leave it alone
Leave it alone and don't atempt to repair this problem. These are stress fractures and may or may not grow beyond what you have here. I guarantee if you add any kind of liquid, chemical or glue to these fractures you are inviting them to grow into a crack. These fractures are micro in nature and many of them are not even on the surface. With the exception of water, all thin viscosity liguids and glues will be drawn into the fractures via capillary action and in most case expand in the fracture, making the problem even worse. I pesonally would not attempt to fix this problem until you have an actual crack. At that time, I would stop drill the crack and then introduce with a sryinge, an acrylic/plexi glue such as "Rez-n-Bond" 'Hope this helps.
John Van Lieshout
Toronto, Ontario
RV6A 80%