This is by far the best caulk I have used. We put crown moulding and baseboards through a 2000 sq foot house. I bought 3 tubes of this. I was very happy with the performance and durability. I actually used this to repair places that I had used a different caulk that wasnt as good as this stuff. Takes paint very good too. I will always use this for my finish trim work. Love it!

I recently had an Energy Recovery Ventilation (ERV) system installed due to low fresh air flow through my house after crawlspace encapsulation and attic insulation. The HVAC consultant told me to seal the baseboards of the outer walls of the house after the ERV was in place. He recommended Flex Shot sealant because it has enough stretch to allow baseboards to expand and contract during seasonal temperature changes. Some Amazon customer comments for that product were low, so I investigated other elastomeric sealants, narrowing it down to the brands listed below. To avoid problems, I checked the "1" and "2" ratings at Amazon and at other websites for potential concerns:

Sashco Lexel Adhesive Caulk "“ This caulk had high ratings at Amazon and other sites, especially by experienced contractors. However, some regular homeowners remarked that it dried so quickly that they were not able to keep up, and they ended up with a goopy mass. Lexel also has "superior adhesion," which made me worry it would cure before I could fix a mistake.

Sashco Big Stretch "“ Big Stretch also had high ratings, and DIY types said the handling characteristics were good. A number of people said it is a magnet for dirt and dust, so people should paint over it. It is NOT marked as mold and mildew resistant, but it was labeled for baseboards.

Red Devil 0770 Lifetime Ultra Premium Elastomeric Acrylic Latex: If I had a big job and cost was an issue, I probably would have gone with Red Devil ($3.98 Amazon add-on item). It is mold and mildew resistant and paintable and ratings are strong, but at least one person noted handling issues.

A few other brands of caulk were for seasonal weatherproofing, which was not practical in this case.

For my average DIY skill level, Big Stretch was the best choice. It had such superb handling characteristics that I finished all of the outer wall baseboards in my small ranch house in about 5 hours. The ALLWAY TOOL CT31 3 In 1 Caulk Tool made it easier to work efficiently and accurately. Big Stretch took long enough to cure that I had plenty of time to switch tubes when the first tube ran out halfway through a baseboard. Stray drops on the floor and my hands were easy to remove with Windex.

This may not be best practice, but I applied painter's tape to create a border on the floorboards once, applied the caulk to 2 walls in a row, then went back to the first wall (about 20 minutes later) and applied white Behr Premium Plus Paint and Primer in One with a soft brush and light strokes, then lifted off the tape. The caulk held up well, but since it was still an opaque white that early, I couldn't tell whether the paint completely coated it. The picture shows the baseboards the day after application, by which time the caulk was clear. Although a few streaky paint areas (right side of picture) showed by then, almost all of the caulk line was completely covered by paint.

Warnings: the bead size markings on the tip underestimate the width of the opening if you cut the tip at a 45° angle. E.g. if you cut at 45° halfway between the 1/8" marking and the end of the tip, you'll get a 1/8" angled opening that is perfect for baseboards. Also, when the tube was almost empty, caulk leaked out all over the caulk gun base. Fortunately, this was easy to clean up with a few Windex-soaked paper towels.

This is a superior caulk that scores an easy 5/5. With minimal preparation, DIYers can expect perfect results the first time.

Strechy, holds paint well, but dries too fast for some fine finish work. It is difficult to clean up excess. If one goes slow and very carefully in application for finish / trim caulking, results can be good. So far, no shrinkage used on bare pine and hemfir trim prior to primer and paint. So far, no issues holding Sherwin Williams premium wall and window primer paint with Pro Classic on top of that. Problems cleaning up stray excess or caulk that dried too fast were the worst in very warm and dry temperatures.

If there is no shrinkage or other issue in a year or so, I'll add a star!

Update, one year later:
As promised, one star added from the initial four stars a year ago. Everything I painted inside, every place that I used this caulk is still holding up fine. This is a very good caulk. Making the smallest possible opening, combined with a good caulking gun that stops when released, makes the job go well.

No shriking or similar issues so far. If things are not good in another year, I'll knock it back to four stars.

Just completed filling my driveway at the sidewalk seam and so far this product is holding up and doing the job. I also used the clear on my patio seam against the house (some settling) and it has stopped the water seepage. Will use this a lot and have two neighbors that also purchased this product on my recommendation.

Another reviewer mentioned that this is a dirt magnet. Ditto that. This stuff works well, works easily and does stretch, but it's a dirt magnet to the nth degree. So, I have purchased 8 to 10 tubes of this and will purchase again, but use only in places where I'll be painting over it. That seals it and for that purpose it works very well.

One thing I really like - I take a partially used tube, and I've done this several times, and leave it sit on the shelf in my garage. It's hot summertime as I use this, and yet I can come back 2 weeks later, put in calk gun and squeeze a 2mm piece out that's hardened, and the rest is still good to go. I don't have to stick a nail or something else on the end. I like that. If it's doing its job 1 year for now I'll update and add a star.