Hello,

I am curious about the differences between the loctites. I have red loctite, seen blue loctite and heard purple colored.

I read in several posts that people using wrong type of loctite for servo horn screws and having troubles. For example pacer has red and blue.

So what are the differences and where to use which type/color loctite?

Engine carb screws?
Engine muffler screws?
Metal gear servo horn screws?
Engine bolts?
Blind nuts?
Metal to plastic, any need?

As I know the screw, bolt size detrmines the type/color, then what is the most all around loctite for RC airplane use?

I am posting this in beginners forum instead of questions so that new comers also benefit from the answers.

Thanks,

I use blue for everything. Red requires a torch for removal. http://www.permatex.com/selector_cha...ctor_chart.asp Calls for purple for bolts under 1/4 inch. I've never used the purple.

Use the stuff that says it can be removed. The other stuff is for permanent connections. My blue loctite is removable.

Only use blue

My dad has some that comes in a stick, like a glue stick, it dosent come off once youve used it, its heavy duty. I used blue on the blind nuts for my motor mount, hasnt budged yet, go with blue.

Thanks,

Unfortunetly I used the red one on the mufller and carb screws of my 46FX. I never tried removing them after using it so will see what will hapen when I want to remove them. Hoping to get them out.

I will use blue from now on.

Permatex site was good info, thanks.

Blue for any metal to metal type threads. As for plastic I would not use Blue. I am almost posative blue has a oil base. It will attack the plastic parts. ZAP used to make a plastic compatible thread locker. I agree red is only for extreme service.

Mark Shuman

Loctite is a registered trade mark of one brand of thread locker. Red Loctite is called stud and bearing mount because it was designed for locking press-in rocker studs into small-block Chevy heads. A buddy used to use it to hold bronze props on his 70 mph rc hydroplanes (no nut!) and change them with a torch. Blue is a general use removable product; I have used green, very thin, designed to be applied to fasteners that were already assembled; it would wick its way into the threads and set up in the abscence of air. The original is still the best.

Cobra78,
I too used Red on my OS46FX muffler bolts. I got one out luckily but the other, I stripped the Hex in the bolt head first. I ended up having to use a dremel to cut the head off and a punch to drive it out.

I only use BLUE now, its tight but removeable with hand tools.

Cobra78,

There are many types of loctite, but fortunately you can get away with using just loctite 242 (blue) which is the removable. Loctite 262 (red) is designed for permanent mounting of things like threaded studs. Since we are sometimes using very small threaded fasteners in our hobby, there is Loctite 222MS which is a removable pink formula that is designed for very small threaded fasteners. These three formulas are designed for threaded metal fasteners. If you want to glue in a non threaded stud or something like that then they also have a variety of other formulas. I am not sure if there is a formula for non metallic fasteners - their website may have that info (see post from davidinmi). As an engineer, I have specified a number of their products, as an R/Cer, I use 242 (blue) for everything and it has served me well.

Steve