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Ron Lanter of Protec on
July 26, 2011:
Spot/Sweep blast, then apply a full coat of epoxy like a Carboline 890 and then come back with another full coat of 890 and walk away. You said economical. Stay away from urethane. It's expensive and over-rated, and, trust me, it will fade in this heat.
Thomas Selby of Retired on
May 19, 2011:
Well, first test for lead in the old coatings on the tank. Then proceed with surface prep based on your findings. Clean and remove old coatings and corrosion. Apply a barrier coat of an anti-corrosive, high-solids, thin-film epoxy. Spot prime with an epoxy mastic the bare metal areas because these areas will fail sooner. Then full coat with a two-component polyurethane. There is no economical system because the real cost is in the labor. Don't be penny-wise and pound foolish.
Gregory Berg of AEP on
May 18, 2011:
Economical system: HPWC Spot power-tool cleaning (SSPC- SP 3); touch up with zinc-rich epoxy; and apply two coats of high-build acrylic. Common system: HPWC Spot power-tool cleaning (SSPC-SP 3); touch up with zinc-rich epoxy; apply an epoxy intermediate; apply a polyurethane or polysiloxane topcoat
Billy Russell of D&R COATING INSPECTION on
May 18, 2011:
A zinc/epoxy/polyurethane system is one recommended a lot. I have used this system a lot with great success, although there are cheaper systems out there. This system, if applied right, has a great life span. Stripe-coat the weld seems between coats for added life span.
M Ehab of North Valley on
April 7, 2012:
There is nothing easy and very low cost like applying 2 coats at 40 Microns DFT of aluminium-pigmented paint based on a flexible penetrating alkyd oil.
Mike McCloud of Amex on
April 23, 2012:
Billy, I like that system, although we have used a pre-prime instead of zinc and have tanks that are still holding up after 15-20 years.
remko tas of Futuro SRL on
April 11, 2012:
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It depends on the relation of labour costs and paint prices in your country. In Bolivia, where labour is relatively cheap and epoxy and polyurethane paints are expensive, for overpainting exteriors that are not yet too rusty, the best economical option would be to manually sand the surface lightly and overcoat with alkyd paint.
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