Frequently Asked Questions


Piston skirts and crowns:

How thin/thick can APC™ be applied?
As little as .00035” per side (.0007” diameter) to .010” per side (.020” diameter) or more.

What is the price for APC skirt coating?
Prices vary according to the number of pistons. There are also additional charges for extra thickness, oversize pistons and large diesel pistons. The cost schedule is listed on the ORDER FORM.

What is the turn-around time?
Standard processing time is 7 to 10 days.

What if I need them sooner than that?
We offer expedited services ranging from same day processing to guaranteed 5 day for an additional fee. These fees are listed on the ORDER FORM.

Does it matter whether the pistons are new or used?
No, we can successfully coat either type.

What if my piston skirts already have a coating on them?
Coating preparation includes removing any existing skirt coating to insure the best adhesion.

How much weight does the coating add to the piston?
The weight that APC adds to components is negligible so there is no need to re-balance any part of the rotating assembly.

If I want to coat my pistons will I have to change my clearances?
No, continue to use your preferred set-up. APC is designed to be self-clearancing and can be accurately applied to a thickness tolerance of .0005” +/-.

Which abradable coating is right for my application?
APC is offered in several different formulations. The engine information that you provide on the top of the ORDER FORM will help the coating lab determine the correct formulation to use.

How do you know how much coating to put on my pistons?
We can either target a final bore dimension or just add a specific thickness. That and the engine information that you provide on your ORDER FORM will help the coating lab determine the correct amount.

My cylinder bores are different sizes. Can you size each piston to a specific bore dimension to fit each cylinder?
Yes, we can size each piston for a specific bore. Please include a note indicating the bore size for each cylinder of your engine (Example #1 = X.XXX”, #2 = X.XXX”, etc.). Be sure to check the box labeled “Individual sizing” (located just under “Additional Charges”) on your ORDER FORM. Write “SEE NOTE” in the blank space next to “Finish Bore Size”.

How long will the coating last?
Many dry film lubricants are designed to be "sacrificial" and eventually wear out. APC is designed to clearance itself until the optimal fit is achieved. The porosity of the coating helps maintain the oil film that the piston is riding on. Theoretically the coating could last indefinitely under these conditions.

Do you offer a crown coating?
Yes. ThermBar is a reflective type coating composed of ceramic and metallic materials.

How thick is it?
ThermBar as applied is .0025” or less.

How long will the crown coat last?
Barring any catastrophic failures, ceramic thermal barrier coatings are virtually permanent.

What components can benefit from coating?

APC –pistons, oil pumps, superchargers/blower rotors, turbo housings, gears

Thermbar –pistons, valve faces and stems, exhaust ports and combustion chambers