Nick to game:BloodSeekerUR
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Increased Resistance
Tantarian has perfomed some interesting and suggestive tests[5] with fire resistance.
His results are basically consistent with the theory that a "low" UV is worth one "point" of resistance, a 5-star trinket is worth two, a highly-resistant armor (such as a Volcanic Demo Helm) is worth four, and you simply add up your total resistance from all sources (the numbers don't quite line up, but they're close enough that that may be due to round-off error). This would mean that the highest resistance total that can be displayed in the UI is 8 points, but he took less damage with 10 points than with 8, so higher values apparently make a difference.
The effects of resistance appear to be an exponential decay in the amount of damage taken, where every 4 points of resistance negates roughly 40% of the damage (thus, 8 points negates around 65%).
However, Tantarian does not report the effects of resistance on duration. Other experiments with curse resistance indicate that resistance affects the duration and the number of weapons and vials affected, so it is logical to assume most status resistances have multiple effects, and those effects may be highly specific to the particular status.
There is a forum thread[6] on the wiki editors forum dedicated to collecting results of resistance tests.
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are for armour/helms, not shields. They are totally different. The current wisdom is that additional fire on a shield which already has fire res does nothing at all.