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Apply Sealant — Install the New Kitchen Sink

Beginner5 hours

Part of project

Kitchen Sink & Faucet Replacement: A Complete DIY Guide · Step 4 of 5

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In this video

Apply a new bead of sealant to fill the gap between the countertop and the sink.

Goal: Seal the gap between the sink and countertop

  • You could either get a tube caulking gun or a smaller squeeze tube. However, if it is a smaller job, be advised that you may not use a full caulking cartridge and it may go to waste unless you have another application for it.

Used in this video

  • Caulk Gun/Squeeze Tube (brand: DAP Kwik Seal, Caulk Gun: Manual) · optional — Applying the new caulk
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FAQs

What specific tools are absolutely essential for a beginner to replace a kitchen sink and faucet, beyond standard household items?

A basin wrench, like the Husky 16PL0127, is crucial for reaching and tightening nuts in confined spaces under the sink. You'll also need an adjustable wrench, a 6-in-1 screwdriver (e.g., HDX 120SD12D), and a sturdy bucket (Unger DB02) for catching water. Don't forget plumber's putty and silicone sealant.

What are the most important safety precautions beginners should take when working with water and plumbing under the sink?

Always ensure the main water supply to the sink is completely shut off before disconnecting anything to prevent flooding. Wear safety glasses to protect against drips or debris, and have plenty of old towels and a large bucket readily available for unexpected spills. Be mindful of confined spaces and potential sharp edges.

Is 5 hours a realistic estimated time for a beginner to complete this kitchen sink and faucet replacement project?

While 5 hours is an estimated time, beginners should typically allocate a full day (6-8 hours) to account for potential unexpected issues, learning curves, and trips to the hardware store. Rushing can lead to mistakes and leaks, so take your time and follow each step carefully for best results.

What's a common mistake beginners make during this project, and how can I avoid it or troubleshoot it?

A frequent mistake is not properly sealing the sink's rim or adequately tightening water connections, leading to leaks. Ensure you apply a continuous, even bead of silicone sealant around the sink's edge, and hand-tighten all water supply and drain connections, then give them a final quarter-turn with a wrench. Always perform a thorough leak test after installation.

Transcript
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there is nice and dry okay so now if you get all the old off you have a few choices for actually quite a lot of choices for the new or sealant that you use now I like to use a little kitchen and bath seem like in these smaller tubes like this you can go with a nice gun this is an old one you can see how grody it is and just get a two cartridge like this but for these smaller jobs you're not going to use a ton of talk so for these kind of cartridges you may only use a fraction of it and these don't once you clip the tip they don't really stay very well and you'll probably waste the rest of it even this look at this tube here you're only you're not going to use it all and once again it's cut and probably a lot of its gonna go to waste unless you have other applications also if you have really tight corners like we've already figured that this back portion of sinks really tight these more flexible tubes are much easier to kind of get back here than these more stiff caulking guns so again for I like this but if you like the cocking gun go for it okay so taking off the cap here you'll notice that it is sealed the tip then so you'll have to cut this with a knife or razor blade now looking closer at this particular tip if I could focus in here you can actually see a little some couple of lines here that help guide you in terms of how to cut it you could cut it any way you want as large as you want you could either do it in an angle which I recommend or you can even just do straight on now these guidelines are a little bit misleading because it doesn't really tell you the size of the actual opening because the plastic tip here has a thickness and so what I would recommend is try to get a hole which is maybe as small as an eighth to perhaps a quarter of an inch and start you might have to cut it several times we kind of start small and if you need to make it larger make it larger just don't pick a line because quite often that might be a bigger hole than you would like and there you go got it on my first hit and that's about the size I want so that's about 1/4 of an inch now as you apply this I wouldn't worry too much about it curing or drying right away it will take a little while so you have plenty of time and I would think a smaller bead rather than the thicker beat you could always add more later but the initial pass will not look that pretty but I'll show you a technique at the end to smooth it all up now you're not trying to actually fill in this entire space…

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