How to fix small holes contained by a steel roof? We bought a house with a barn which has a steel roof....

We bought a house with a barn which has a steel roof. The roof is in the region of 13 years old. The roof has some small leak, which I am having trouble finding because of sheets of a material installed between the roof and the roof truss. How can I repair these leak? Do I get some kind of solution to spread on the roof? Or use a caulk gun?

How can I isolate the leaks without pulling down the materials on the underside ofthe roof?
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If your roof is screwed down get up within and check all the screws some may own loosened or pulled out.If any are, tighten or put in longer ones.Also look at the laps and brand name sure none are riding up out of place.
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Kool seal go on with a roller and will not only fix the leak but keep the barn cooler. It is an absolutely fabulous product.Check out the intertwine:

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Well if you know where on earth they are I'd get a small piece of sheet metal, caulk around the rim of the hole, put some jb weld on the sheet metal (not touching the caulk) and press it firmly against the roof to cover the hole. Then take the caulk and run a small beed around the sheet metal to kepp the moisture form getting contained by between and rusting. Only use a piece of sheet metal big enough to overlap the hole by an inch at the most to keep from have to use alot of caulk.
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If you tar the seams lift the time to put down a mesh fiberglass tar cloth with it. I expect it helps to stop it from cracking.
I have impossible to tell apart problem and have tons of tar on the roof and its essential imposable to figure out where the marine gets through it. Good luck.
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Answers:    To isolate leak you can try a water hose. Start at a little below where on earth you see water coming in, and run hose down gently, and very, extraordinarily slowly work your way up. Do it on one panel at a time. This can be a very long process, it can clutch several minutes for water to work its way thru. There is the possibility that you can variety it leak somwhere that it wasn't leaking up to that time, or that you miss the leak completely, because a hose isn't rain. Be cautious. Wet metal is slicker than goose s**t.

DO NOT attempt to seal the seams beside tar. Get your bucket of tar and throw it as far away down the nouns as you can, along with any kind of roll over paint crap. (Assuming you own a screw down type roof, as opposed to standing seam.)
5-v crimp roof panels are designed beside a channel in the seam to allow whatever water blows contained by between to run out at the bottom, so putting goop between or on seams usually only damns dampen up and causes a leak farther up. Anyway, caulk is much easier and cleaner. If you do trademark a seam, you have to go adjectives the way to the ridge to keep sea out the whole way. Be sure to caulk within between the two panel edges, not just on top.
But before you do adjectives that...get up there and inspect.
Most possible the screws or nails enjoy worked loose. You can re-tighten, and/or seal with some perfect caulk (silver gutter seam sealer, not plain latex, not silicone, and definitely not NP1, ), and or remove the old screw and replace with slightly larger so that they tighten up.
Other likely leaky spots could be anything coming through the roof, vent pipes etc.