Hi Charles, after reading of your situation, I would tend to think that what you have is not really the telegraphing phenomena, but is stressed glass. I can't tell from the picture or from your description, but if you have fine white lines that follow some of your strips, then it is most likely stressed glass from movement between the strips.

I have seen this happen when there is an excess undercut to the bevels between two strips. It may appear like a tight joint from the exterior, and it most likely is, but it is only glued along such a small edge that any slight flexing breaks the glue joint,and stress cracks the cloth. The 4oz cloth on the exterior only adds strength in tension. This also makes sense since the sides have pulled away from your forms. Humidity certainly can be the culpret here. Removing or lifting the deck from the forms could also cause this.

If you lay your cloth on at a bias, this will add strength and help to reduce or even eliminate this problem. If the weave of the cloth follows the strips then its kind of like bending form feed computer paper at the perforations rather than at an angle across the perforations. (hope my point isn't too abstract)

Things will strengthen up once you get the inside glassed, but you should make certain not to let the deck flex. I would suggest hot glueing a number of scrap strips across the shear from side to side to keep it from further damage while you sand the interior and to keep things at the proper width. Keep a few of these stiffners in place to hold the shape while glassing the interior.

After you get the interior done, you can go back and fix the white-ish stress lines by very carefully sanding them without sanding through the glass. Use 400 grit sandpaper so you don't damage the cloth. There is a very fine point at which application of epoxy will resaturate the cloth and the lines will dissapear. If the lines don't dissapear after adding epoxy, you didn't sand quite enough. Be very carefull because you don't want to sand through the cloth fibers and lose all its strength.

By the way, telegraphing is usually refered to as the effect of having the weave of the cloth show through the epoxy after it was previously not visible. It is very common as the epoxy tends to shrink with time pulling tighter into the weave. Most often this happens with added heat as well as time. For example, you have a mirror smooth finish on you kayak, then you have it out in the sun on some very hot summer days, the epoxy can further shrink thus "telegraphing" the weave of the cloth to the surface. Your mirror finish is now gone and you have a very slight textured finish. Some manufacturers use curing ovens to aid in eliminating this effect. The telegraphing effect is much less noticeable on finer weaves than they are on coarser weaves, due to the thickness and amount of epoxy. For example, 4oz cloth will show less telegraphing than 6oz cloth.

If you look closly at any older fiberglass boat you will see evidence of telegraphing. (it happens with resins as well as epoxies).

Tom