EPOXY MASTIC RUST PROOFING PAINT – MEDIUM GREY – 2025 NEW FORMULA
Rustbuster’s Armaguard Epoxy Mastic is our award-winning Epoxy paint, ideal for both brushing and spraying. Supplied as a two-component pack, along with thinner. The mix ratio is straightforward: 3:1 by volume, plus thinner.
Kits can be shipped with Thinners, Panel Wipe, Mixing Cups and Stirrer’s or simply the paint on it’s own
Each pack includes mixing instructions and recommended thinner quantities. Although Epoxy Mastic can serve as a primer-finisher without needing an over-coat, it can also be over-painted with single or two-pack products.
This paint is typically thick and requires proper mixing and thinning with the provided thinner. For the best results, follow the instructions carefully. Refer to the links below for additional guidance.
Rusty’s Tips: A practical guide on how to use this product
Painting galvanised steel might take a little more preparation, Read More ClicK Here
Product Reviews
” I purchased some EM121 paint a while ago after reading numerous reviews, REALLY impressed with several factors, coverage, lack of mess, no runs, no brush bristles, how long the mixture was useable for and the quality of the results..”
Mr A Pearson – May 2019
| Product description | 2 pack modified high build epoxy rust proofing paint. | |
| Pack description |
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| Application temperature | Can be applied to steel as low as 0c. The steel must be at least 3 degrees above the current dew point. (See our dew point calculator.) | |
| Thinning | Use only the epoxy thinner supplied, from 5 to 20% max. | |
| Application & recoating | Brush or spray.
A second coat or topcoat can be applied any time after approx. 5 hours* with no need to abrade between coats. If recoating or topcoating once the first coat has fully cured (after approx. 7 days), lightly abrade first with P320 paper. * At 20 degrees centigrade. Longer interval may be required in colder conditions. |
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| Spraying | Minimum 1.8mm nozzle or a HB (high build) primer set up. Test atomisation on a test panel first. Viscosity will vary, i.e. thicker in colder temperatures. Data correct at 20c.
Conventional Spray (Air) 3-4bar – 44-58psi Airless Spray 18thou tip, 150bar – 2176psi |
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| Pot life | Pot life is the time from mixing the two components together to the point at which the mixed paint is no longer useable. For EM121, you have 2.5 hours pot life once mixed at 20c – longer at colder temperatures. | |
| Shelf life | We recommend storing upside down in a dry place at around 20c. In these conditions the product has a shelf life of 12 months.
Do not store below 20c as this can affect performance. |
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| Disposal | Allow any excess mixed paint to cure in your mixing cup and throw away as dry waste. | |
| Cleaning | Clean up with standard thinner or gun wash. Do not thin the paint with standard thinner as this will affect the paint cure. | |
| Safety | Use in a well-ventilated atmosphere. Use a respirator face mask when spraying or brushing in an enclosed space. Please see the MSDS (material safety data sheet) in our data sheet area.
Wear suitable protective clothing, gloves and eye protection. |
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| FAQ’s |
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Downloads and Media
Matt Tompkins Practical Classics Morris Minor coated by us.
FORD RANGER Coated in Epoxy Mastic for Ford Motor Company for the RNLI Case history
