SAC-2 Assembly Compound

I recently purchased the Park Tool SAC-2 Assembly Compound to use on my bike's carbon seatpost and handlebars, and it worked exactly as advertised. Application was easy — just a small amount provided a noticeable increase in grip, and I didn’t have to overtighten anything to keep it secure. It gave me a lot more confidence, especially knowing how sensitive carbon components can be to over-torquing.The texture of the compound is a little gritty because of the silica, but that’s what helps create the extra friction. I was careful to wipe away any excess to avoid cosmetic blemishes, as the instructions recommended. Also, I made sure not to use it on any threaded parts or bearings, since it’s not designed for that.Overall, I’m really happy with the SAC-2. It’s a simple product that makes a big difference in keeping everything tight and protected. Definitely a great buy if you're working with carbon or aluminum parts!

This lube works great on my carbon parts as well as my dropper post.

Well... I was skeptical about this product. I weigh in at around 210 lbs. The street pavements in my city are, shall we say, the result of defered maintaince: lots of pot holes, asphalt patches and surface breaks. In other words, my butt was like a jack hammer on my seat post. After every ride I had to readjust my seat post. But, lo and behold, this lube compound from Park Tool actually does the job. I've ridden several hundred miles since applying the compound to my seat post and I don't think its moved a millimeter. Good product that does what it's designed to do. BTW, my seatpost is alloy, not carbon.

My One Up dropper post has always slipped in the seat post of my Hightower. I previously tried the Finish Line carbon grip paste, but that had absolutely no effect and the dropper would still slip. The grit in the Finish Line paste is fairly coarse/large and I suspect the grit was not actually getting between the interface when inserting post due to the clearance being tighter than the size of the grit. The Park Tools carbon grip compound has a much smaller, finer grit than the Finish Line product and initially I wasn't convinced there was anything in it when feeling the compound. I applied the Park Tools compound to the whole tube, convinced it wouldn't work, but then I couldn't get the post to go down fully due to all the friction! I had to remove the compound and apply to a much smaller area of the post to get it to insert and even then I could feel there was significant friction. The carbon compound product that you need will likely depend on how tight the interference is between your seat and post, but I found this to work where the Finish Line product did not.

I believed I needed this Supergrip Assembly Compound with a dropper seat post. I had to use an adapter between the aluminum frame and seat post. Manufacturers of dropper seat posts caution the user about proper torque for the seat post clamp. Since there are internal parts that move vertically, over-torqueing could interfere with post movement or damage the dropper outer tube. The compound increases grip without the need for excess torque.In addition, deburring the ID of the seat post tube is important for proper grip. I have a mountain bike that had an interference-fit 1/2 down the tube. The welds for a brace had distorted the seat post tube. An adjustable reamer was required to remove 0.15mm of aluminum. The moral is to ensure parts fit without undesirable influence.I do not believe a normal installation between two parts would require this compound. I’m installing a dropper post that fits the seat post tube. I will not use this compound because proper torque – measured with a torque wrench – will clamp without slipping. In addition, the compound does damage finishes. Some excess torque on a standard seat post would be fine. Just determine the weakest link (clamp, bolt, post) and do not exceed the recommended force. One more thought: torque can be applied to dry or wet threads. If lubrication is applied to threads, then derating the torque value is necessary. Dry Torque x 0.6 = Lubricated Torque (>/= 30W oil, anti-seize, grease).The SUPERGRIP™ compound comes in a toothpaste tube that is an identical size, cap, and colors to Park Tool: ANTI-SEIZE COMPOUND, POLYLUBE 1000™. The only difference in these tubes is the heat-seal end of the tube is a different color. I used green painters’ tape to identify this compound with a noun & caution. If somebody other than me uses these tubes then they hopefully see read the label and see the caution.

Using a tiny bit helped me get the appropriate torque on a steam bolt, fixing a potentially deadly twisting issue.

Great for your bike or other needs, very happy with this product. Would recommend.

Worked as advertised