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Cappy wins the cigar, it's close enough. Close by saying most of it is heat cycled related. All those rides before the valve cover come apart for that last sealing time [even a few inspections of reuse]. Designed so the rubber buttons collapse, already home'd the rubber cover gasket. Those shrink from the squeeze, or 'loss of memory' is the once supple rubber to expand and cause tension.

This is basically the same effect of turning down the orings on an oil filter, being a bitch to spin off now. The old style CB-4's Honda line of oil filter cartridges in reusable spin on oil filter cage and bolt. Where those 12mm hex heads would be torn off due to the over compression of the large oring. Where you can feel you barked down the dipstick on the bike, and have to use pliers to loosen it. That's the power of its compression type sealing effect.

So the compression of the rubber finely gave out and needs replacing. If nothing has changed, look at the OEM paper and rubber. Paper and most rubber parts go on dry, and meet a dry contact point(s). About the only thing needing a sticking of, is the channel of the valve cover to be cleaned of the OE type gasgashit used to hold it in place.

Amateur move and the bonding agent to mend a leak? Last thing you want is to contaminate the engine with a piece breaking off and just let's say it a squid move, a cheapass fix, buy new or your call, your oil passage failure.

-Edit-

Kris, I believe they are both the same gasket replacement wise. Look up Ron Ayers and walk yourself to the parts page of both heads. Shows both the same part number. Say the one fails, it would be wise to change both. They are like a bulb. One fails you change the other soon. Rather than wait, let the case of beer wait -wink-wink.
 

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You think if I pull the covers and add some silicone to the old gaskets that it’ll hold till payday?
I do not recommend any type of condiment added to the sandwiching there of. I do not like to remove parts just to do it all over again. The less I move things the less damage to the threads and beauty covers. Perfect example is the side cover tabs broken off.
I do not like to sway away from the 'fix it one time' mantra of mechanics.

I will come up with a 'my repair is going to out beat your leak at it,' buy saying the magic words, Mr. Goodwrench intake manifold sealer. Sureasshit seals like it's not going to 'come back' on you is the 'had to use the othershit didn't you' mantra.
 
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