To achieve expert results, please take the time to carefully read and understand the following directions before you begin your restoration project. These directions are meant to be general guidelines only and do not cover every application or environmental situation. If you have remaining questions or concerns, please call us toll-free for technical assistance.

ALWAYS WEAR PROTECTIVE GLOVES AND SAFETY GLASSES. ALWAYS WORK IN A WELL-VENTILATED AREA. Please heed all labeled warning and caution notices on all products.


Surface to be primed must be dry and free from dirt, oils, rust, and other contaminants. Sandblasting is the ideal surface preparation as it leaves the ideal anchor pattern for paint adhesion. After sandblasting, use clean compressed air to blow off any residual blast media. Be sure to wear surgical-type gloves when handling to keep natural body oils off the prepared surface.

If not sandblasting, prepare surface by using wire wheel, wire brushing, or abrasive sanding using 60-80 grit paper. This method will provide a surface equivalent to that provided by sandblasting and allow the desired surface profile or anchor pattern. Wash surface well with KBS Klean at a 10:1 (Water/KBS Klean) ratio, rinse and let dry thoroughly. Allow surface to thoroughly dry before proceeding. Mask off areas not to be coated & protect adjacent areas with drop cloth or newspapers. For best results, apply when XTC and room temperatures are between 60-80° F (16-27° C).

Application Guidelines:

NOTE: Before applying observe safety precautions. Extinguish fires, flames and hot coals. DO NOT SMOKE. Turn off pilot lights, stoves, heaters, electric motors, and other sources of ignition during use and until vapors are gone. Make certain surfaces and contents of item to be painted have completely cooled down. Do not apply unless surface temperature is between 60-80° F (16-27°C).

Surface temperature must be at least 5°F (3°C) above dew point.

Aerosol Spary Can Application:

Shake can vigorously for one minute after mixing ball rattles freely to ensure proper mixing and to prevent sprayhead from clogging. Repeat shaking frequently during use. Hold can 12-15 inches from surface and apply using steady, even strokes. Apply two light coats, allowing 15 minutes drying time between coats. Clean sprayhead immediately after use by turning can upside down and spraying until no more paint appears. If clogging occurs, remove sprayhead and clean with a fine wire. Replace carefully, pointing can and sprayhead away from you. Allow primed surface to dry a minimum of 30 minutes before top coating with the KBS Xtreme Temperature Coating or KBS Motor Coater color of your choice.


XTC Primer Primer is a two-package system consisting of a base component and zinc that are mixed together before use. Sift zinc dust slowly into base with continuous mechanical agitation. Mix thoroughly until free of lumps. Pour mixture through 30-mesh screen. If a partial unit is needed, mix by weight 10 parts of the Base component with 3 parts Zinc Dust component. Do not open containers until ready to use. Re-disperse any settled-out pigments by stirring with a paint paddle or power mixer to a uniform consistency. Keep lid on container when not in use.

Application Equipment:

Conventional spray is the recommended method of application. However, XTC Primer may also be applied by airless spray, brush or roller. Do not apply XTC Primer in heavier films than specified since blistering may occur.


Use only wooden-handled brush with short China bristles. Do not use synthetic-bristled brushes. Do not flood surface with coating. Brush out thoroughly, maintaining a continuous wet edge and uniform appearing paint film.


Use only wooden-handled roller with phenolic shank and core, and 1/4-3/8” nap. Do not flood surface with coating. Roll out excess coating on a suitable, screened surface. Then roll out thoroughly, maintaining a continuous wet edge and uniform appearing paint film.


If you are just applying XTC Primer and not overcoating the XTC Primer with XTC, you will want to do a temperature cure before putting the coated piece back in use.

After proper dry time, XTC Primer will be dry to the touch and can be handled using care, but resins will not reach full hardness until heated to approximately 350° F (176° C) for 20-30 minutes. For headers or manifolds, this can be done in an oven, BBQ, or by mounting back on engine and run to normal operating temperature.

For automotive applications, you can also temperature cure by installing and running the engine. After the parts have been installed, start the engine and let it idle until the XTC begins to smoke then immediatly shut engine off and let the manifold or header completely cool naturally to room temperature. Repeat and do this process three times total. After the thrid time, perform a fourth temperature cycling and on the fourth cycle, let the engine run until the XTC smokes and this time let the engine continue to run until the smoke from the XTC dissipates. Once the smoke has completely dissipated, turn the engine off let the surface come back to room temperature naturally. It is importnat to follow this process to gradually cure the XTC.

NOTE: Coating can emit potentially harmful vapors during the first few heat/cool cycles. Allow for full and proper ventilation during initial heat curing. Avoid excessive heat during this initial "break-in" period, as the resins need to be tempered into the substrate to provide proper adhesion.


Only thin XTC Primer with KBS #1 Thinner.

Note: Use of other thinners not approved by may hinder product performance.

Dry Time 70° (21°) 50% RH:

XTC Primer will air dry tack and thumb print free within 1/2-1 hour. Allow 8 hours dry time between coats. Allow 24 hours dry time prior to shipping and handling if coating is not heat cured. Surfaces coated with XTC Primer in the air dried state can be handled and shipped prior to a heat cure as long as shipping and handling procedures for thin filmed systems are followed.

Avoid mechanical abrasion during shipping and handling. Higher temperatures will reduce tack free, recoat and shipping times. Allow one hour solvent flash off period before heat curing or placing into service. Optimum film properties require a heat cure of 350°F (177°C) for 30 minutes. Equipment protected with the XTC Primer in the air dried state will heat cure when placed into service.

Clean Up:

Thoroughly flush spray equipment and hoses immediately after use with KBS #1 Thinner or lacquer thinner. Dismantle spray equipment and clean parts, brushes and rollers with KBS #1 Thinner or lacquer thinner.


Store in a cool, dry place with temperatures between 50°F and 100°F (10°C and 38°C). Keep container closed when not in use.

Technical Data:

XTC Silicon Zinc Primer
Generic Type
Silicone Zinc Dust
Dark Grey
Temperature Resistance

1000°F (538°C)
1200°F (648°C)
Percent Solids by Volume
Dry film thickness per coat
1.5 - 2.0 mils (37 - 50 microns)
Wet film thickness per coat
4.5 - 6.0 mils (112 - 150 microns)
Theoretical coverage
530 mil. sq. ft. (12.65 sq. m./liter @ 25 microns)
Drying time @ 50% RH
To Touch
To Recoat
To Ship
50°F (10°C)    70°F (21°C)
1 hour    30 minutes
12 hours    8 hours
48 hours    24 hours
Full cure @ 350°F (176°C)*
30 minutes
Weight per gallon
12.0 lb. (5.5 kg.)
Flash Point
45°F (7°C)
Pot life
Shelf life
1 year
Volatile organic compounds
4.9 lb./gal. (583 g./l.)

*See Dry Time Section