EDIT: Adding test findings to the top of this thread, original post will follow.
TEST RESULTS:
So I did some testing with Kazuki (thank you), and we found that the MAX UV vp shield did indeed withstand more normal damage than the LOW UV vp shield. In multiple tests done in depth 19, we found that the MAX shield could withstand 11 hits from a jelly cube, breaking on the 12th. The LOW shield withstood only 10 hits, breaking on the 11th. Additional testing with a base lichen found the MAX shield could withstand 15 hits, breaking on 16. The LOW shield withstood only 13 hits, breaking on 14.
I think this is pretty definitive proof that some shields' actual defense can extend beyond the range of their displayed bars (All shields tested showed a maxed out normal def bar). Whether or not this particular shield would have reached its cap with a lower than maximum UV is still debatable, and this does not constitute proof that all shields' defenses can extend beyond their bars. But I'd say it's a safe bet.
ORIGINAL POST:
Alright, so I've heard there's a max to status resistances, but is there a max to ordinary defenses (shadow, normal, etc)? If the def bar completely fills, is that it? Or can a uv carry it past the edge of the bar?
I'm asking because I have a uv normal def plate shield, and I'd like to know if it will have any effect on the final product (which shows a full bar in normal defense).
In the case of armour, short answer, yes. If you look on the bottom left of your character sheet and mouse over the icon there, you will see the total bonuses you get from your gear. If you get a UV bonus to normal def and your bar is already full on that icon though... who knows if it still counts.
In the case of shields, no idea because it's hard to test. Shields are handled as their own entity; that means the defense and resistances on a shield only affect the shield bubble they make, and don't actually add to your own defenses. If a monster hits your shield bubble, it takes health off your shields health. The only thing that can reduce the damage your shield bubble takes is your own shield defenses and resistances.