Crash, I did use a 1.4 LPH400 to spray the epoxy. The iwata air gunsa az3 hte2 primer gun with the 2.0 tip was for the 2k build primer only.
This from the Old Tech Sheet:
EPOXY PRIMER
1:1
Product Numbers: Gun Tip: 1.4 or 1.5
#6600- White
#6610- Gray 1.4 if used as a sealer
#6620- Black
#6700- Activator
Available in quarts and gallons
Mix:
1:1 or 1 part SPI Epoxy to 1 part SPI Epoxy activator. This epoxy needs no induction
time, unless you reduce this epoxy with urethane reducer. If reduced an induction period
of 15-30 minutes is recommended.
Although this epoxy does not require an induction period unless you add urethane
reducer, we strongly recommend you activate the epoxy by first stirring very well and
then allowing it set 10-30 minutes. Stir once again before spraying and the longer in
between coats the better.
Uses for SPI Epoxy:
This epoxy is one of the finest available and it is great for use on any type of metal or
aluminum if properly cleaned. This epoxy eliminates the need for an acid-etch primer.
Use this epoxy on bare fiberglass or SMC before applying body fillers or 2K primers for
best long-term results.
Prepping the Surface:
Metal or Aluminum must be clean of all rust and oils and any films. Never clean metal
with lacquer thinner or reducers of any kind. Raw metal of any type is always cleaned
best with a waterborne wax and grease remover such as SPI’s part # 700-1. This is most
important for prepping aluminum and sand aluminum or metals with 80 grit DA paper.
Spraying:
Spray two wet coats for normal applications. For special projects such as restorations
Spray one coat and let it flash about 10-30 minutes at 70° degrees or higher. Then spray
second coat for maximum corrosion protection. If one coat of epoxy is used wait 60
minutes before painting.
Spraying Continued….
This epoxy does not need to be sanded if painted over within 7 days. Always paint or
primer over the epoxy within 7 days. After 7 days the epoxy should be sanded and recoated
with epoxy for best adhesion.
Body Fillers:
On any restoration it is always best to apply the body filler over the epoxy rather than
bare metal for best adhesion and corrosion protection. If one coat of epoxy is used then
the body filler can be applied in 60 minutes. When applying two coats of epoxy, wait
over night before applying the body filler. The epoxy does not need to be sanded before
applying the body filler.
Wet and Dry Sanding:
If for some reason you need to sand a large area of epoxy, the epoxy will dry sand best
after 12 to 16 hours. Wet sanding with moderate pressure can be done after 60+ minutes.
To use as a Paint Sealer:
To use the epoxy as paint sealer, reduce 10-50% with the proper temperature range
urethane reducer (this is very important). Spray one wet coat ONLY, let it set 60 minutes
and apply paint. For sealing of a potential problem paint job, apply two coats of epoxy
with proper flash times between coats and let it set over night before painting.
Pot Life:
24-48 hours depending on humidity and temperature (sealed container)
V.O.C.
4.6 ready to spray.