MMS-K328 CS 9903 is a primer for bonding room temperature vulcanizing silicones to various substrates. CS 9903 is recommended for bonding CS 3802, CS 3808 and CS 3810 to metals. It may also be used to prime certain other rigid surfaces, such as glass, epoxy and polyesters. All surfaces to be bonded should be thoroughly cleaned.
Solvent washing is suitable.
The primer shall be applied to the substrate so that a uniform pink surface results. Allow the primer to air dry at least one hour before applying the silicone compound. The appearance of a slight precipitate in CS 9903 does not harm the product. Do not attempt to re-dissolve the precipitate, but decant the clear primer from the top of the container. CS 9903 contains volatile solvents and should be used only with adequate ventilation.