Topic: Master cylinder cap black out

[CharlesTurner]

Powder coating will leave the part looking like it has thick layers of paint on it.  With a cast/rough service, it just won't look right.

[J_Speegle]

Powder coating will leave the part looking like it has thick layers of paint on it.  With a cast/rough service, it just won't look right.

+1

Would have that "dipped in plastic " sort of look  and then would it match the cap and the bail also as well as the booster if it were a power brake car?

[jwc66k]

Has anyone tried powder coating a master cylinder cap? Seems like it would be nearly impervious to brake fluid.

Powder coating will leave the part looking like it has thick layers of paint on it.  With a cast/rough service, it just won't look right.

True, and it may not screw on.

Would have that "dipped in plastic " sort of look  and then would it match the cap and the bail also as well as the booster if it were a power brake car?

I believe the question was about the cap, not the reservoir. Still a no-no.
Jim

[carlite65]

Powder coating will leave the part looking like it has thick layers of paint on it.  With a cast/rough service, it just won't look right.

he is talking about the cap only, not the cast cylinder.

[J_Speegle]

he is talking about the cap only, not the cast cylinder.

Then the coating will reduce or  eliminate the printing into the metal of those later caps and not match the surrounds - other items that would have been painted at the same time originally with the cap

[carlite65]

i agree. powdercoat is not the best choice.

[lathamjr]

I've searched and can't find an answer regarding brake master cylinder paint for my '65. I get it that the master cylinder and cap are painted semi-gloss black, but want to know what kind of paint works best for it.
Is there an extra consideration because of the brake fluid or is it the same as the rest of the engine compartment? I welcome your feedback, the more detailed, the better.

[Bob Gaines]

I've searched and can't find an answer regarding brake master cylinder paint for my '65. I get it that the master cylinder and cap are painted semi-gloss black, but want to know what kind of paint works best for it.
Is there an extra consideration because of the brake fluid or is it the same as the rest of the engine compartment? I welcome your feedback, the more detailed, the better.

Krylon brand is what I use however it doesn't really matter because If you get regular conventional brake fluid on the paint then it will typically get damaged regardless . If you use silicone (Dot 5) brake fluid then the paint will not be effected if it comes in contact with the fluid.

[lathamjr]

Thanks for the reply. I have never considered Krylon so I learned something. I typically use Rustoleum or Dupli-Color high-heat paints under the hood. I paid attention to a post that mentioned how the MC is painted as a unit but didn't see any paint type mentioned.
I've got to work on my brakes so I'll flush the system and use what you recommended.

[Bob Gaines]

Thanks for the reply. I have never considered Krylon so I learned something. I typically use Rustoleum or Dupli-Color high-heat paints under the hood. I paid attention to a post that mentioned how the MC is painted as a unit but didn't see any paint type mentioned.
I've got to work on my brakes so I'll flush the system and use what you recommended.

If doing a change over you have to flush very thoroughly  because the two are not compatible and will jell up if they come in contact with each other. besides flushing the system with alcohol I took the Master , wheel cylinders , proportioning valve dissembled them and re lubricated the seals with the dot 5 before putting them back into service . That is Just me. 

[lathamjr]

I'm going through the system that thoroughly so it'll be flushed well. Alcohol is cheap...especially compared to Dot 5. A paint that could stand up to glycol-based fluid would be nice.

[Al Bundy]

I would not use DOT 5 in a classic vehicle but maybe that’s just me.

[rrenz]

I used duplicolor wheel paint on my 66. They say it’s designed to resist brake fluid (being that it’s wheel paint). It’s been a couple years now with no issues.

[J_Speegle]

I used duplicolor wheel paint on my 66. They say it’s designed to resist brake fluid (being that it’s wheel paint). It’s been a couple years now with no issues.

Just for other's benefit, finish looks great, but there would have been a plug inserted in the threaded boss when painted normally leaving a small round shadow around where the fitting attaches (a bare metal area) to the master cylinder. The plug would normally stay in place until removed and the line attached to keep contamination, dust, dirt and so on from the threads

[rrenz]

I actually did that however my plug wasn’t big enough and the paint sneaked around the plug.you can just barely see the bare spot on the left.   I did however also paint it with the cap on so the threads are still bare.