Sealing Stove Pipe

I'm going to use DVL double wall stove pipe ( http://www.northlineexpress.com/6-inch-dvl-stove-pipe.html ) for a pellet boiler. The pipe is black. Now, I have a feeling that because of the chimney cooling with non-use, there may be transitory positive pressure in the venting when the boiler starts and heats up. Therefore, I'm figuring that sealing the pipe may be necessary.

The tape and the silicone are both ugly. I understand with tape, the sections could be easier to remove than with silicone? I'm thinking I'll use a T off the rear exit to go up, then a T for a draft regulator, and then a T into the chimney pipe; so, hopefully not too much disassembly required.

Does the high temp tape hold up? Could I paint it before application to ameliorate the ugliness factor? Are the tape and silicone equivalent?

Does everyone seal their pipe, or perhaps should I see how it works first?

EDIT: Upon reading the manual, duh, it seems that 45 degree angles and silicone and/or tape is required. So I guesss that answers a couple of questions.

maple1 said:

I didn't do any sealing on my pipe, can't help much with that - but if you try to put in a cleanout T wherever possible (more than one is OK), and get them in the right places, chances are you will never need to disassemble.

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Thanks.
The manual encourages 45 degree elbows. So, I'd have a 45 after the boiler, then a tee for the draft regulator, and a tee going into the bottom of the metal chimney, which couldn't be avoided because of the need to brush the chimney. Would it be possible to take off the draft regulator and stick a brush with a flexible rod in there to clean the stove pipe? The length won't be very long, after all.

arbutus said:

I used the black stove pipe caulk on double wall stove pipe in the past, and couldn't tell it was there unless you were looking right in the joint from three inches away.
Take care during installation and have a roll of clean paper towels on hand to wipe up any excess.

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I didn't realize there was such a thing as black pipe caulk. Is it silicone? The only thing I've seen is red, but I haven't done an exhaustive search.

I'm not sure either about the damper. I'm going to try to go with a Windhager damper instead of the usual Field Controls. I figure if I only have to remove the baro damper once a year I could live with that. Good idea with the sump pump hose. You don't feel the need to brush as well as vacuum?