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 NAILHEAD RUSTING
Reddish-brown stains on the paint surface.
- Non-galvanized iron nails have begun to rust, causing bleed-through to the top coat.
- Non-galvanized iron nails have not been countersunk and filled over.
- Galvanized nailheads have begun to rust after sanding or excessive weathering.
When painting new exterior construction where non-galvanized nails have been used, it
is advisable to first countersink the nailheads, then caulk them with a top quality,
water-based all-acrylic or siliconized acrylic caulk. Each nailhead area should be spot
primed, then painted with a quality latex coating. When repainting exteriors where
nailhead rusting has occurred, wash off rust stains, sand the nailheads, then follow the
same surface preparation procedures as for new construction.
| PORTER SYSTEM RECOMMENDATION
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Primer:One Coat of ACRI-SHIELD Acrylic Bonding Primer No. 515
Finish:One or more coats of Super Premium ACRI-SHIELD Acrylic Finish No. 519 Flat, 739
Satin, 619 Gloss
Or
One or more coats of ACRI-PRO 100 Acrylic Finish No. 929 Flat, 3729 Satin, or 6029
Semi-Gloss
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