20 Best Rtv Sealant For Intake Manifold (2023 Updated)

Permatex has and will always be my “go to” for sealing up an engine. Whether I’m working on a motorcycle or automobile they always have what I need and a great product. Just did a timing belt on the old 1999 Honda Civic with 235k miles and oil pan gasket while I was down there, permatex is what I used where needed on the engine and it got us safely to and back from Justin TX and we live in Ada,OK.

Thats a five hour round trip with a fuel/leg stretch stop. Thanks permatex for the peace of mind and autozone for the parts and products keeping this old car kicking. By the way we got 35/36 miles per gallon average, I topped the car off and reset the trip meter and divided it by the gallons it took to refill the car.

More accurate in my opinion than the modern day on board computers that try to calculate to many variables.

There are times when “black” colored silicone adhesive or sealant is nice to have. There are not many brands of black colored silicone in a tube out there, and Permatex is probably the best of those.

With regard to the adhesion and “texture” of the product once set, I can only compare it to the GE Silicone which works so well. I think the GE Silicone II is top notch: Dries firm yet pliable and has excellent adhesion.

This Permatex product, not as much. I have found that while it is a good sealer where a black silicone is needed, it is not a “great” sealer as it can be a little runny, a thinner viscosity than the clear GE Silicone, and takes seemingly long to dry.

I also had a project “pull apart” using the Permatex only to re-do it with GE Silicone II to achieve satisfactory results. The “rare” black color earns it credit. But the dry time, inconsistent setting up and lack of finished pliability knocks it down.

Overall, 4 stars although I wish it were worthy of a 5th star.

I kept cutting back on the applicator until it was barely a funnel at all, ended up just tossing that applicator & squeezing out of the tube. It worked fine on the water pump but for the thermostat housing I went back to good trusty High Tack.

Still think I prefer High Tack. Suppose it depends on how much pitting. Do like the color tho, looks like Ford Blue.

The gasket maker worked great. It was the perfect replacement for the missing gasket.

I am restoring 2 Ford 8N tractors. this works great intake and exhaust manifold. These tractors are 70 years old. This permeated fills in all the rust pits and seals the gaskets. NO more manifold gasket problems.

Great stuff.

Easy to use great buy, well worth the use, helped keep gasket in your lace

Great price, bought this for extra protection on a valve cover

This product is the real Mcoy for a job that requires a true sealant. I used this recently to seal a repair on a determinedly leaky garden bird bath, pure RTV silicone sealer is the only thing that will withstand immersion in all weather conditions.

The fact that it can be used to assemble all-glass aquariums tells you all you need to know about its adhesive strength and sealing properties. Not to be confused with the cheaper silicone-based sealants sold for domestic use in bathroom sealants etc.

I use this pretty much on everything. Simply the best on oil pans aluminum or metal and also timing covers. I will not use anything else on timing covers but this. As far as valve covers just but a new gasket.

This stuff works great but if your valve cover gasket is worn you need a new gasket. Reason being imports usually have o rings or rubber washers. You really can’t use silicone on those. And once those gaskets are crushed for the 1st time no tightening in the world is going to make it not leak.

I am a Master Technician and have been for over 15years. So please consider my advice or not. :).

This product was easy to use and dried quickly and with no leaking after application was done in 15 minutes. The product is great due to the company standing behind it Permatex. Permatex is widely used for oem automotive and industrial applications all over the world.

I have no negative comments about this product and I would recommend it to anyone who has not used it before. The product did not disappoint and I will certainly use it again in the near future with out a doubt, true that.

is there a difference between the two pictures in the quality or performance why i ash?the junk i got is in no way a good gasket maker it dissolves on contact with gasoline in the past i used it for everything i used it for 40 years until i retired 11 years ago and i never ever seen it dissolve like that WHAT CHANGED OR DID IT? i have used it to repair fuel tanks 100″s of them i just don’t get it.

Seems to work well so far. I recommend it for gasket forming.

This was my first foray into making anything out of silicone myself. I was a bit intimidated but thought that a tube of one-component silicone can’t be too hard. I printed a mold for my Geeetech A20M OG hotend off of Thingiverse and squeezed some of this paste into it.

After about a day (with some mild heating in between), the mold was ready. I got best results when I “painted” some dish soap all around the mold using a paintbrush. The cured product is flexible and has withstood many hours at 200-240 °C so I am happy.

I have used Permatex products for years. The only time I have ever been disappointed is when I grab a 20 year old tube to find it dried and hardened. I bought this tube particularly for doing some exhaust seals.

My neighbor recommended it saying he uses it instead of exhaust manifold gaskets and had great luck. I have always had great luck on other jobs, but never considered it for exhaust manifold use. Since I will be using it on a diesel, which runs cooler than a gas engine, I shall give it a try.

I used this for making “silicone boots” for my monoprice maker ultimate 3d printer, and for that, it seems to work pretty darn well, as opposed to mixing my own weird silicone solution. Using 1bigpig’s thing printed in black PLA, I coated the insides of that thing with costco dish soap, and then squeezed enough to maybe fill between 2/5 and 1/2 of the container, and then squeezed.

After a day, I got a usable silicone boot to fit onto my printer. the thing definitely had enough for me to make at least 6 before i decided to stop, and i had maybe gone through 2/3 of the tube. the only negative i’d have is it’s kind of a pain in the ass to get off your hands or any other surfaces it comes in contact with, it kind of stains copper, so i’d be careful about that.

it washes of your hands but takes some work. but really, it seems to withstand my printing temps at 260C without any problems so i’m satisfied.

Sold as a glue , it’is a basic silicone paste for motors , may be good product but not for description It’is a dangerous deception to use that as a glue for calipers

I used this Pro Seal for the first time and it worked great! It was recommended by a mechanic for my diy project, working on the valves of my motorcycle. It went on easy and it works great. I highly recommend this RED RTV PROSEAL.

I needed to replace a starter-motor on compact tractor, and this stuff worked great! No need to spend endless hours searching for OEM or cheesy generic seal kits. This was a life saver so to speak.

I used this gasket maker when replacing a valve cover gasket. I applied it to a couple of places on the sealing surface where the engine block joined the timing chain box. I immediately put the gasket and cover in place after applying the gasket maker.

The silicone was dry enough to run the engine in about an hour’s time, but I waited a couple of hours to be sure it was tough enough.

I have purchased and used this product and brand repeatedly with good dependable results. Easy online purchase and pickup at advance auto.

Gave a neutral rating because I had to return this product; never used it. Engine, to received this product, had scored cylinder walls; engine was discarded.

If you’ve never used black silicone RTV this may be hard to use at first it’s very inexpensive but offers the best way to seal oil pan gaskets or water pump gasket. BUT if you do it wrong it can be a very frustrating experience.

This brand is decent and works with most gasket applications but doesn’t offer the best quality.

Good packaging, decent storage life and easy to apply spout. Forms a seal well, seems durable, easy to work with. Sticks well to most surfaces, chemically inactive to most surfaces, forms a smooth, tight gasket.

Easy to use. A small nozzle (tip) would be helpful for smaller jobs.

I’ve always use this product combined with the original gasket for better adhesion of components. However the downside is, when not in use the tube gets hard and becomes unusable. I found out if you inject petroleum jelly into the cap and screwing it on will preserve it for a much longer period when storing it.

When you return using it, just squeeze the tube removed the top layer of petroleum jelly and repeat the process again when storing it.

I used it to cement in the fiberglass gaskets when I rebuilt my VC woodstove. It did a great job on both vertical and horizontal surfaces, where the temps reach 600F. Comes out of the tube easily (unlike the black junk which is sold as woodstove cement), and goes a long way (25+ linear feet).

I’m very happy with it.

I ordered this because it matched the tube I’ve had for years that is finally about gone. The 26b description. What I got is what Walmart has on the shelf for $4 and change. Felt like I got taken with false advertising.

Optimum Grey has a little different characteristics than the Ultra Grey, but more of a refinement than a large change. Seems to have a little longer working period when spread out on the parts, maybe a little thinner in consistency, and maybe just a little more effort to clean up overages (clings better?) – but all in all works great.

This last Summit order I ordered out both Ultra and Optimum and will continue testing. Okay, I went back to the original Ultra Grey after having a valley pan seam come up and weep oil. I cleaned things off and applied the Ultra Grey and no leaks.

So it seems that while the Optimum has a higher temp rating and still makes a great seal, it doesn’t quite like to stick as good to the surfaces. Now sometimes this can be a good thing if you need to take things back apart, but maybe not quite as good as the old Ultra for areas that need to be “glued” down.

Good tack and set on a nv 4500 transmission top. It seals tight and hangs on. Doesnt set too fast to work with the pieces to get everything lined up. It is sticky gooey stuff and will get on everything like never- seize so use caution not to get it all over.

I bought a large tube, forgot to plug the opening! Other than that, its strong and durable! Holds Up To High Torque (Thicker Than The Normal Product)

Best silicone I have ever used. I admit I was unsure because I had only used silicone in a tube for the last 40 years. but read on. This pressurized can is 1000 times easier to use than the tube style silicone.

I recommend cutting just the very tip off the dispenser tube. Silicone is released from the can by slightly bending the nozzle just like a can of whipped cream an this makes it very easy to put down a consistent bead of silicone.

I also noticed how smooth the product is with no air bubbles or texture. Lastly how many times have you used a new tube only to find it has hardened by the time you want to use it again. not this stuff.

Numerous times I have needed to use it again and all you do is pull out the little bit of dried silicone out of the end of the nozzle and its ready to use again. It doesn’t harden all the way through the dispensing tube and become useless.

so I intentionally don’t wipe the end off because leaving a little silicone coming out the end makes it easy to pull it out and resume. Great product! I will use nothing else after trying it for the first time.

This is the first time I have used RTV in a can. What a world of difference. It dries in the nozzle when not used, typical but it comes right out the next time you use it, only about an 1/8″ of dried RTV and then good RTV.

I’m happy and will buy it again. I will never use the tube RTV again.