Any tips on how to seal the butt-splice connectors without a heat gun? I thought about using a lighter or torch but am afraid I will fry the wires. Any advice will be much appreciated.

 

Most heat shrink will respond to a normal hair dryer. You might give it a shot.

 

I've used a bic lighter and it works fine. Just make sure you don't hlod the flame on any one spot long enough to melt or ignite the connector. Practice on a scrap piece of heat shrink to get the feel for it.

 

Like mentioned above, you can use a bic lighter, just keep it moving till the shrinkage occurs and you'll be OK.

 

NO! Don't try to seal a butt splice with a lighter. It's not designed for that. That's only for heat shrink.

You will burn up a butt splice and never get a waterproof seal. You need to use heatshrink over a bare crimp or an insulated crimp.

The best kind of heatshrink has a hot seal lining. As it is heated it melts the inner liner and flows outward. Totally waterproof.

Regular heatshrink is next. Make sure you have a good overlap on the wire. Invest in a heat shrink gun. Same thing as a paint strip gun. I have seen them as cheap as $13 on ebay.

The heatshrink responds faster and no black crap or burnt wires. They make heatshrink in all kinds of colors and sizes.