Because I feel like rambling...
I've noticed a lot of people using 3/8" fiberglass rods for strong, lightweight sword cores. And I've also noticed that their sword tips blow out very fast. I think this is due to the small diameter of the core not being secured well enough and the core foam being torn up by the repeated impact of combat. Generally speaking, the smaller diameter of the rod increases the force put on the core layer of foam, leading to blown tips. While I am not personally a fan of these small cores, here are some ideas that might help some of these problems.
-Duct tape the tip of the core to a slightly larger diameter and then cover this with some cloth tape. Taper this down to a smooth teardrop shape so the tip of your core looks a bit like this:
(==----------------------
This will make the tip larger and help prevent it from blowing out as quick. The cloth tape ensures that there is good adhesion between foam and core when DAP is applied.
-For your core layer of foam use GOOP brand adhesive instead of DAP. GOOP dries to a hard rubbery consistency and helps stiffen the core layer without cutting it up like tape would...
-After the last layers of foam have been applied to the blade, DAP the flats of the blade and let the DAP dry. Take a long strip of strapping tape and lay it against the flats starting near the tip. Then use a couple more strips of cloth tape over the tip of the blade.
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