And wasn't Spider-Man chronically running out of web fluid at key moments back in the 60s and 70s? He made do well enough.

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You're mixing and matching a little too freely here.

First, the webbing Spider-Man uses in the comics is ARTIFICIAL. It doesn't work like real spider webbing, and so can be anything the writer(s) need it to be. At a convention, several years back, a fan told me about his idea for how the webbing worked, and it was quite brilliant. He imagined that it expanded rapidly when exposed to air (and therefore did not need to be under pressure in the cartridges), and then shrank just as quickly as it "dried" (thus actually PULLING Spider-Man thru the air).

These are not considerations that can be made with biological webbing. The restriction imposed automatically by this concept is that the webbing has to be the same as what a real spider produces. And that means Parker has to produce and store vast quantities of it, within his body. So, where? And how does he produce so much of it so quickly?

Has he run out in the comics. without refills handy? Yes -- occasionally. But with biological webbing, that's something we would expect to happen all the time. One quick trip across Manhattan -- a lot less, in fact -- and he'd be out.

Stan and Steve knew what they were doing. And their approach, unlike Sam Raimi's, was based on internal logic, not ego.

How GREAT would the commercial for "3M's Web Fluid" be:

"Hang your pictures...for an hour! 

Fix your child's favorite toy...for an hour!

Need that broken bumper to stay up there...for an hour? 

Then 3M's All-New Web Fluid is for YOU! 

For an hour!"

"2) Where does he store it?4) What happens when he runs out?"
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I don't get this either - doesn't this fall into the camp of where does the Hulk's extra mass come from?

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I don't get this either - doesn't this fall into the camp of where does the Hulk's extra mass come from?

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Hardly! The Hulk's "extra mass" can actually be explained (with comicbook science) in a number of ways, none of which would require Banner himself PRODUCING the extra mass, in the way biological webbing requires Parker to produces large amounts of alien fluid.

Also, the Hulk's extra mass is not PERMANENT. Banner does not have to "store" it within his body when he is not the Hulk.

Break it down: Banner gets zapped by gamma rays, and transforms into a monstrous humanoid. A whole lot of extra mass comes from "somewhere". In the Marvel Universe, there are plenty of places that "somewhere" could be.

Parker gains the abilities of a spider from a radioactive bite, and if this includes biological webbing it somehow also includes the rearranging of his DNA in ways that have nothing to do with spiders. Webbing that emerges from the ends of his arms (but not his legs?), and does so under enormous pressure, for instance. That's some pretty darn clever radiation, there! Must be spider-totem magic!

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Neither does Spider-Man. That was something Shooter forced Mark Gruenwald to include in the original OHOTMU, against howls of complaint from just about everyone who'd ever even heard of Spider-Man.

Shooter was under the mistaken impression that spider's "stick" to walls, which he declared to be "icky" (his word) and so he came up with this "solution".

As to the "spider-sense" -- try to swat a spider and see how fast it it scurries out of the way. That's the advantage to all those body hairs and eight eyes, of course, but Stan and Steve merely literalized it into something else.