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What type of silicone should i use to seal my dizzy cap with? It gets moist inside when it rains so i need to seal it

 
Rep Power: 518

Silicone RTV will only make the cap darn near impossible to remove later on.
Replace the rubber seal that sits in the groove where the base of the cap sits on the distributor.
It comes with a cap from Honda.
OEM parts are usually much better quality than aftermarket.

Pic from Majestic:

 
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I have always gotten a new seal ring when I ordered a cap off rockauto.com. As posted, dont use a sealant. Will just make things worse later and god forbid you have a bad oil leak into the cap, its just gonna fill up or be stuck if you seal it shut.

 
Rep Power: 367

i used in another car the silicone to actually make a "new" seal, but then, that might be too hard a job in this case.... i take yer car still causing problems, then...

 
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Just installed that o-ring this evening.

I dipped the o-rink in brake fluid first. I've read that soaking them in brake fluid helps to expand and swell the o-ring as brake fluid is designed to absorb moisture..... I can't prove it but it makes sense and it's easy enough to do...

 
Rep Power: 518

OMG you kids...Not everything you read about is a good idea....
That was totally unnecessary, and may cause the seal to swell, or deteriorate prematurely.
It WAS a brand new seal, already the correct size and everything.
It did not need to swell to do its job.
A dozen years from now when it is hard as a rock, brake fluid might do something to it, but it was completely unnecessary now. Wait, it is dirt cheap, when it gets to that point why not just replace it instead of jacking with it?

Pull it out and rise it off with plain water ASAP before it gets all damaged and mushy.
Install clean and dry in that application.

 
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Well, as the last (no brake fluid) O-ring came out in about 10 hard and crumbling sections, I think I'll take my chances. Brake fluid and rubber O-rings are no strangers as seen when rebuilding various components of the vehicle braking system.

 
Rep Power: 518

Rubber tends to do that after being heat cycled several thousand times.
Just sayin'.

Different composition, different materials.
Brake rubber swells horrendously when exposed to petroleum products.
Engine rubber seals can swell when exposed to brake fluid.

 
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It looks like I may have a tiny little experiment on my hands.... I'll take a peek every few years and see how she's doing...lol
Take care