Detailed Product Description:
Metalprep®79 is a non-flammable multi-purpose phosphoric acid-based
cleaner and pre-paint conditioner for most metals. Application of
Metalprep®79 leaves the surface chemically clean and corrosion free.
Metalprep®79 can be used to deep clean and etch a metal surface prior
to paint or to prepare a surface for a subsequent chemical coating like
that produced by Galvaprep® SG on zinc and steel or Alodine®1201 on
For light oxidation and corrosion removal, dilute one part Metalprep®79
with two parts water. For heavy oxidation and corrosion removal, dilute
one part Metalprep®79 with one part water.
For each 100 parts of bath, add 25 parts Metalprep®79 to 75 parts of water.
Spray Application using a 62-G Applicator:
Set dilution control on 3, allowing a mix of three parts water to one part
Acid-resisting (rubber, stainless steel, or plastic) buckets, troughs, or other
suitable container should be used to hold the diluted Metalprep®79 cleaning
and conditioning chemical solution.
Ordinary steel pails may be used for a short period. Galvanized containers
should not be used. If production conditions warrant, troughs may be installed
to catch cleaner run-off for reuse.
A typical treatment time where Metalprep®79 is in contact with metal surface
is between one and two minutes. The Metalprep®79 should not be allowed to
dry on the metal surface or be permitted to re-oxidize prior to a thorough rinse.
Metalprep®79 is normally applied at temperatures between room and 120°F.
If drying occurs, rewet with the diluted Metalprep®79 prior to water rinsing.
A thorough rinse with clean water is necessary to remove both residual
Metalprep®79 cleaning and conditioning chemicals and oils that have been
lifted from the metal surface.
A clean surface is a "water-break-free surface". The rinse water sheets out
over the metal surface where oil will cause water to bead up. Chemical
cleaners will lift and break down oils on the surface of the metal and assist
in rinsing them from the surface of the metal.
Corrosion is generally the result of a chemical battery reacting on the metal
surface. In the presence of moisture, this corrosion can grow out over the
metal surface. Metalprep®79 cleaning and conditioning chemicals attack
the surface oxides and the corrosion battery. The result of this attack is either
the corrosion battery being removed or deactivated.
Blushing or yellowing on steel is often seen when using Metalprep®79 solution.
This chemical reaction is not injurious to quality, provided it is not rust or pits.
Blistering and corrosion problems are often the results of poor rinsing. Salts and
soils trapped under a paint film eventually lead to problems.
To aid in the removal of heavy oxidation or corrosion, heating and/or applying
the Metalprep®79 cleaning and conditioning chemical with an abrasive pad will
shorten the treatment time. Scotch-Brite pads are often used.
Metalprep®79 should not be used on a sand blasted part because rust will form
instantaneously. The rust, then formed, is harmful to quality. Paint soon after
the work is dry in order to prevent soils or rust from contaminating the prepared
Metalprep®79 cleaning and conditioning chemical will freeze at 14°F. It is
recommended that the product be keep from freezing. However, should it freeze,
simply thaw it in a warm place and stir it prior to use.
Waste Disposal Information:
Applicable regulations covering disposal and discharge of chemicals should
be consulted and followed. Disposal information for Metalprep®79 is given
on the Material Safety Data Sheet supplied with this product. The processing
bath is acidic and contains phosphates. Waste treatment and neutralization may
be required prior to discharge to sewer.
Before handling the product, the first aid and handling recommendations found
in the Material Safety Data Sheet should be read and followed. The processing
bath is acidic. Do not get in eyes, on skin or on clothing. In case of contact,
follow the recommendations found in the Material Safety Data Sheet supplied with
Packed in 1-quart plastic bottle.
Click here to download pdf copy of MSDS
Click here to download pdf copy of Technical Process Bulletin