Shop primer is an primer thin primer for
clean steel that keeps the steel from rusting during construction.
Most shop primers contain low amounts of zinc. They are "weldable"
or designed so that they will not contaminate welding, so it is not
necessary to grind them off before welding. The down side is they
only last about 6 months so they are not great for long term
building projects. Another argument for not using shop primer
is that you depend on it doing it's job well because sandblasting
the hull is expensive and you don't want to do it twice.
primer is zinc metal powder mixed into an inorganic silicate paint
binder. Zinc primer is 85 to 90% Zinc by dry wait is
recommended. The zinc is electrical conductivity and allows the
primer to provide sacrificial protection to any areas of exposed
underlying steel. Organic Zinc primers consist of zinc
suspended in epoxy and while these are good the Inorganic zinc
primer that uses silicate paint has faired better in NASA
Thermal Ceramic Spray
http://xiom-corp.com $15,000 for the application equipment
and it requires 30 cfm of compressed air.
MetalTec 2300SS BallPark $160/gal 2mil coating
Steve Stefansic 800 321 2978
Sherwin Williams Commercial 664-5694 --Eric
Zinc Clad II Ethyl Silicate Inorganic Zinc-Rich Coating Binder Part
Part Number: B69V00003
$135.49 Binder, Zinc Dust $225.05 -- 5 gal Kit =
Cleaner to work on steel thereafter, welding easy with weld
compatible primer Interplate 937
http://ceram-kote.com/ ceram-kote 54 CeRam-Kote 54*.
($195/gallon covers 128 sq. ft.)
Weld Through Primer
Sigmaweld MC -- Sigma is now PPG
2 parts, 24 hour pot life, overcoat in 6 months
Coal Tar Epoxy or Epoxy Tar
Robin Posgay, Houston Texas: (281)
Order Entry: 800 627-2968 -- Prices are good till Jan
MC-Zinc 100 thinned by 15% to get 1 1/2 to 2 mil. Best to
spray. Normal coverage 200 sg. ft / gal
Might last 5 years. Blast, prime and then spot blast, weld,
spot blast again and spray to reprime.
Prior to final coat, pressure wash, add final MC-Zinc 100 and
then MC-Tar - Red / Black and top coat.
MC-Zinc 100 -- 85.68/gal, 256.04 /3gal
MC-Tar - Red / Black -- Black 51.44 /gal
249.37 /5gal Red: 251.45 /5gal
MC Thinner -- $97.00 /5gal -- Use with Zinc and
Square foot estimate:
1 - coat of MC-Zinc 100 at 256.04/3gal. /3 = $85.35/gal
/Coverage rate of 200 sq ft/gal = .43 / sq ft
2 - coats of MC-Tar at $250/5gal /5= $50/gal /Coverage rate of
200 sq ft/gal = .25/sq ft x2 coats = .50/sq ft
Plus thinner, tax, shipping, and application consumables that is
over 1$ / sq ft. Then we still need topcoat and anti-fowling paint.
...This is one of the reasons why we nearly waited until I could
afford aluminum, but our steel plate came to $6.75 / sq ft delivered
including tax. The zinc and epoxy tar coats on each side for
the steel will add another $2 / sq ft. Even still, aluminum
came to about $16.15 / sq ft so there is a lot of up front savings
to cover the cost of blasting, and coatings.
To save money an immersion system is not required on the inside.
Use either MC-Miozinc 100, best to spray or MC-Prepbond 2.8
which is easy to brush.
MC-Miozinc 100 -- $65.04/gal,
MC-Prepbond 2.8 -- $50.62 /gal $245.28
Ameron is now PPG
Amercoat 385 - 2nd coat need to go on within 30 days
Dimetcote 9 --Not for submerged use
Dimetcote 302H zinc primer with Amercoat 370, 385 top coat
Dimetcote 302H is 2 part, 4 hour pot life, 1 year shelf life
Carboline Co Lake Charles, LA
Carbozinc 11, Carbozinc 11HS
International Paint, Inc Houston, TX
I've found over the years that Ameron's 214,
which is a relatively inexpensive as bottom paints go, works well
for me. I use Ameron 302 and top that with several coats of 235
epoxy as base coats, then top that off with a couple of coats of the
Ceramic beads are from Hy-Tech, They are for insulation.
enough to treat 5 gallons cost me about $75 with shipping
and they recommend 2 coats. Cant say how well it works yet but its
supposed to help with condensation also.
Concrete Wash - 2 parts portland cement, 1
part fire clay. Mix to paint like consistency. Apply two
coats over blasted metal. Submerse in water to dry.