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Reddish brown stain on paint surface.
Due to:
- Iron in the substrate has begun to rust causing penetration through to the top coats.
- No metal primer being applied on the steel surface to protect steel from rusting.
Recommendation:
- If non galvanized nail/steel need to be used and is exposed to air, it is advisable to countersink the nail heads, spot prime the area and seal it with siliconized acrylic sealant or water based acrylic sealant, followed by top coats.
- To remove any loose and rusty material before priming process.
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