Frequently Asked Questions
If you still have questions about Corroseal, please contact us and we will be happy to assist you.
How does Corroseal Rust Converting Primer work?
Corroseal Rust Converting Primer chemically changes the composition of rust on steel,
turning the rust into a non rusting barrier layer, while at the same time, primes the steel surface ready
for topcoating. Watch our educational videos to see Corroseal in convert rust.
What surface preparation is needed prior to applying Corroseal?
First remove any loose, flakey rust and old paint, mill scale and visible debris. Wash the surface thoroughly
with a cleaner to remove any oil, grease or other contaminants. Thoroughly rinse the cleaned surface to remove
any cleaner residue that may have been left behind. The ideal surface preparation is CLEAN, TIGHT RUST!
Do I need to thin Corroseal?
No. In fact, Corroseal Rust Converting Primer is very formula sensitive so DO NOT THIN!
Can I apply a primer coat over Corroseal?
Yes, but in most applications it is not necessary. An oil based primer is recommended if one is used.
Can Corroseal be used on galvanized steel?
Since galvanized steel is coating with zinc to prevent corrosion, Corroseal is not effective over non rusted
galvanized steel. If the galvanized steel is rusted, do a test application to determine if there is enough rust
present for Corroseal to be effective. The Corroseal will not bond properly if the galvanized steel is not sufficiently rusted.
Can Corroseal be applied over non-rusted steel?
Yes, but Corroseal works best when rust is present. Do not apply Corroseal over Cor-ten steel,
cold rolled steel, stainless steel or any steel that has been chemically treated.
Can Corroseal be applied over old paint?
Yes, Corroseal will etch prime tightly adhered primer or old paint that is on the steel surface.
Can I use a sprayer to apply Corroseal?
Yes, use an airless sprayer for less nozzle clogging. Corroseal must not be diluted. Immediately after
application be sure to rinse spray equipment well with clean water to remove any Corroseal before it as a chance
to set up.
What protective measures should I use when applying Corroseal?
It is recommended that Corroseal is used in a well ventilated area. If spraying, gloves, goggles and a mask are
recommended because prolonged exposure might cause skin and eye irritation. Please refer to
the Corroseal Material Safety Data Sheet for additional precautionary measures and disposal.
Can Corroseal be applied to a rusted barbeque or wood stove?
No, Corroseal Rust Converter is not considered "heat resistant"
I used a white water based paint over the Corroseal and now have stains showing through the paint.
Some light colored water based paints are subject to tannin staining when the tannic acid in Corroseal is not
fully absorbed during rust conversion. This usually occurs when the painting project has been exposed
to direct sunlight on a warm day. If you see any staining, you should wash the painted surface with a mild solution
of water and TSP, rinse well, then apply an oil based stain blocker before reapplying your topcoat. It's best to
always to do a test patch with your water based topcoat and Corroseal at least 24 hours prior to the start of any
large scale project to determine if it's subject to tannin staining.
Please visit us on the web at www.corroseal.com or call (800) 237-1573