A can is like what $12? If you haven't built the frame up yet it takes maybe 5 minutes to plug the holes with paper towels, spray the stuff in and rotate it a few times? Let it sit overnight or so and you're good to go. I'm not 100% sure it's needed, but, if it helps, that's a pretty low cost, low effort attempt to fix something I'd be kicking myself for not doing 5 years down the road.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"