HOLD*BLAST is a surface passivator
which stops the formation of flash rust for long periods of time, often
several days.
Surface corrosion can occur when water
wet surfaces react with atmospheric oxygen. The formation of flash rust
can be eliminated with the use of HOLD*BLAST, which chemically changes
the active surface of metal to a much less reactive state.
HOLD*BLAST is a concentrated, organic
chemistry liquid, which is added to water and sprayed onto surfaces
during preparation for coating. As a surface passivator, it chemically
changes the active surface of metal to a much less reactive state. It
does not leave a film or residue to interfere with coating adhesion.
HOLD*BLAST also removes soluble salts as
it passivates, and is an effective alternative to hazardous chemical
rust inhibitors..
HOLD*BLAST is a cost effective, environmentally safe and coating
friendly product. It leaves no chemical residue, is
biodegradable, non-hazardous, and is a safe.
Application.
Apply HOLD*BLAST in a dilution of 1:50 with
potable water directly onto the substrate (1 part HOLD*BLAST to 50 parts
water). Sufficient product must be applied uniformly across the
substrate to thoroughly wash the surface, with no areas missed. This may
be accomplished by various methods, such as pressure washer, airless
sprayer, conventional sprayer, roller, brush, pump up sprayer, after UHP
water jetting or during wet abrasive blasting. Wet abrasive blasting or
slurry blasting typically allow much higher dilution rates, often up to
1:250. It is highly recommended that a minimum of a 1500 psi pressure
washer be used. This is to ensure "driving" the solution into the
profile of the surface.
Start work at the highest point and
progress downwards. After the substrate has been thoroughly washed, it
should be allowed to dry, or be dried, prior to coating application.
Usually, dilution may be increased with good quality water and/or low
salt contamination levels. Poorer quality water can often be used, but
will require a higher concentration of HOLD*BLAST. Water quality, salt
contamination levels, humidity and temperature are all variables that
can affect dilution rates and results. Test on a small area and adjust
the dilution rate until the desired results are obtained.
Post-Application. Excess or
puddled water should be swept, wiped or blown from flat surfaces. After
application of HOLD*BLAST, surfaces should always be tested to assure
any remaining soluble salts are at an acceptable level. High levels of
soluble salts will cause premature coating failure and degradation of
the substrate. Test for levels of chlorides and nitrates with the
standard CHLOR*TEST kit. Test for levels of chlorides, sulfates and
nitrates with the CHLOR*TEST "CSN Salts"
kit. Both kits offer the highest degree of accuracy and are the easiest
to use of any complete field test kit available.
Typical time for "holding the blast" is
72 hours or longer with no rain, dew or condensation on the surface. In
highly humid environments, with surfaces contaminated with low salt
levels, the 1:50 dilution should be sufficient. In low humidity and low
salt levels, the dilution ratio may be extended.
