ARCOR铮? Repair.Spec.07.99.1
ARCOR铮?
ARCOR铮? International
a Division of AEC Corp.
Coating Repair Specification
Contents
1.0 Definitions
2.0 Precautions
3.0 Recommended Tools & Consumables
4.0 Intercoat Coating Repair
5.0 Topcoat Coating Repair
AEC Corp., PO Box 273, So. Dennis, MA 02660 Tel: 800-878-9593; Fax: 888-878-9593
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ARCOR铮? Repair.Spec.07.99.1
1.0 Definitions:
1. Holiday: Flaw or defect in the coating that exposes or could expose the
underlying substrate.
2. Stress Riser: Area of the coating, which protrudes abruptly above the contiguous
area coating level. Typically found at coating interfaces, substrate edge interfaces
or large, coating filled, substrate pitted areas.
3. Recoat Window: Time interval during which a subsequent coat of a multi-coat
system can be applied. Associated terms include minimum and maximum recoat
time.
4. Minimum Recoat Time: Time required for a coat to become sufficiently cured to
resist thickness disturbance when overcoated or lightly abraded with fine-medium
grit paper to remove unevenness or to repair defects. A general guideline
determines minimum recoat time to be 10% of full cure per coating product cure
schedule. Minimum recoat is verified by Thumb Twist Test.
5. Maximum Recoat Time: Maximum time allowed for satisfactory intercoat
adhesion without special treatment of the surface of the prior coat. Also the
minimum cure time required before heavy abrasion of coat, i.e. mechanical
sanding with medium-coarse sandpaper or use of rotary grinder or light 鈥榮weep鈥?
abrasive blast. A general guideline determines minimum recoat time to be 20% of
full cure per coating product cure schedule. Maximum recoat is verified by
Thumbnail Test.
6. Thumb Twist Test: The test used to determine that an epoxy has cured sufficiently
to accept application of another coat or for light sanding with medium grit paper
AEC Corp., PO Box 273, So. Dennis, MA 02660 Tel: 800-878-9593; Fax: 888-878-9593
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ARCOR铮? Repair.Spec.07.99.1
to remove unevenness or repair defects. The thumb is pressed into the coating
with moderate pressure and twisted simultaneously. If there is no visible
disturbance of the epoxy and there is no epoxy on the thumb, the coating is
sufficiently cured to accept another coat or for light sanding.
7. Thumbnail Test: The test used to determine whether or not the coating recoat
window has closed. The thumbnail is pressed into the epoxy with enough force to
deflect the nail. If no evidence of an impression remains when the thumbnail is
removed, the recoat window has closed.
8. Tie-in Zone: The feathered zone between fresh and existing coating.
9. Feather: Creating an abraded tapered transition along interfaces between coating
materials or between coating and bare substrate. Feathered edges promote
interface adhesion without the stress riser and unsightly condition that would
otherwise occur at abrupt edges.
10. Mask: To prevent inadvertent overlap onto surfaces that are not intended or are
unsuitable for overcoating.
AEC Corp., PO Box 273, So. Dennis, MA 02660 Tel: 800-878-9593; Fax: 888-878-9593
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ARCOR铮? Repair.Spec.07.99.1
2.0 Precautions:
1. Preening tools may damage some surfaces or change material properties.
2. Coatings that have exceeded allowable shelf life must not be used.
3. Coating material and cleaning solvent fumes and other materials associated with
this process may be toxic. Safety measures specified on MSDS must be followed.
4. Organic fumes associated with coating material fumes in areas serviced by HVAC
charcoal filters may affect filtration systems.
5. Unused portions of coatings may be considered hazardous and must be mixed,
hardened, and disposed of in accordance with customers chemical control
procedures
6. To avoid improper mix ratios, do not mix partial epoxy kits unless mass and/or
volume ratios have been verified using mass/volume ratios as provided in coating
Data Sheet.
7. Ensure that use of chemicals is allowed for the work area.
AEC Corp., PO Box 273, So. Dennis, MA 02660 Tel: 800-878-9593; Fax: 888-878-9593
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ARCOR铮? Repair.Spec.07.99.1
3.0 Recommended Tools and Consumables:
1. Sandpaper
2. Scraper
3. Non-woven abrasive pad such as Scotchbrite.
4. Wire brush.
5. Rotary wire brush, wheel or cup
6. Disc sander
7. Non-woven abrasive disc, wheel or cup.
8. Flapper wheel
9. Abrasive blast equipment using water and oil free compressed air for larger sweep
areas.
10. Pistol blaster for spot blast.
11. Chloride free abrasives;
鈥? 12/40-20/40 Black Beauty;
鈥? 25-40 mesh Steel Grit;
鈥? 24-36 mesh Aluminum Oxide;
鈥? 16/35-8/20 Mesh Silica Sand.
12. Quality Control equipment to monitor air and surface temperature, humidity
control equipment, dust collection equipment as required to maintain specified
environmental conditions and ensure proper air flow.
AEC Corp., PO Box 273, So. Dennis, MA 02660 Tel: 800-878-9593; Fax: 888-878-9593
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ARCOR铮? Repair.Spec.07.99.1
13. Cleaning solvent MEK (methylethylketone) or Isopropyl Alcohol in solvent
controlled areas.
4.0 Intercoat Coating Repair:
4.1 Between coats: Visually inspect coating for obvious defects and stress risers
prior to application of subsequent coating.
4.2 If a minor coating defect is identified record the observation on the ARCOR庐
Daily Procedure Log.
4.3 Determine whether Minimum Recoat Window has passed using Thumb Twist
Test.
4.4 Determine whether Maximum Recoat Window has passed using Thumbnail
Test.
4.5 WHEN coating has passed minimum recoat time AND has not passed
maximum recoat time, touch-up and repair can commence.
4.6 IF coating repair can be completed before the maximum recoat window is
exceeded then apply touch-up coating and blend ridges and/or lumps and level the
surface.
In order for the above test to be valid the touch-up repair must proceed
in the same direction as the coating was/is applied i.e. the first areas the coating is
applied would be the first areas tested and repaired.
AEC Corp., PO Box 273, So. Dennis, MA 02660 Tel: 800-878-9593; Fax: 888-878-9593
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ARCOR铮? Repair.Spec.07.99.1
4.7 If local surface areas protrude above surrounding coating material e.g. runs or
a stress riser, or if debris or foreign matter is observed in the coating the area must be
abraded to level the surface.
4.8 Using medium grit sandpaper or an abrasive pad abrade the coating in a linear
fashion i.e. left to right or up and down.
4.9 WHEN abrading is complete, using a combination of brushing, vacuuming
and solvent wipe, REMOVE all dust and debris from the surface.
4.10 If after abrading the abraded area is determined to be lower than the
surrounding coating, as in removal of debris, apply touch-up material and level the
surface.
AEC Corp., PO Box 273, So. Dennis, MA 02660 Tel: 800-878-9593; Fax: 888-878-9593
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ARCOR铮? Repair.Spec.07.99.1
5.0 Topcoat Coating Repair:
5.1 Visually inspect coating for obvious defects and stress.
5.2 If a minor coating defect is identified record the observation on the ARCOR鈩?
Daily Procedure Log.
5.3 Determine whether Minimum Recoat Window has passed using Thumb Twist
Test.
5.4 Determine whether Maximum Recoat Window has passed using Thumbnail
Test.
5.5 WHEN coating has passed minimum recoat time AND has not passed
maximum recoat time, touch-up and repair can commence.
5.6 IF coating repair can be completed before the maximum recoat window is
exceeded then apply touch-up coating and blend ridges and/or lumps and level the
surface.
In order for the above test to be valid the touch-up repair must proceed
in the same direction as the coating was/is applied i.e. the first areas the coating is
applied would be the first areas tested and repaired.
5.7 If local surface areas protrude above surrounding coating material e.g. runs or
a stress riser, or if debris or foreign matter is observed in the coating the area must be
abraded to level the surface.
5.8 Using medium grit sandpaper or an abrasive pad abrade the coating in a linear
fashion i.e. left to right or up and down.
AEC Corp., PO Box 273, So. Dennis, MA 02660 Tel: 800-878-9593; Fax: 888-878-9593
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ARCOR铮? Repair.Spec.07.99.1
5.9 WHEN abrading is complete, using a combination of brushing, vacuuming
and solvent wipe, REMOVE all dust and debris from the surface.
5.10 If after abrading the abraded area is determined to be lower than the
surrounding coating, as in removal of debris, apply touch-up material and
level the surface.
5.11 IF coating repair cannot be completed before the maximum recoat window is
exceeded then it is advisable to wait until maximum recoat has passed. Heat
may be applied to accelerate cure. Consult the material Data Sheet and Cure
Schedule for direction.
5.12 Once the maximum recoat window has passed Use a High Voltage Spark Test
to locate pinholes/defects. Consult ARCOR铮? 鈥楪eneral Specification鈥? Section
6.6 for Spark Test procedures.
5.13 If a defect is identified circle the area with a chalk and record the observation
on the ARCOR铮? Daily Procedure Log.
-END-
AEC Corp., PO Box 273, So. Dennis, MA 02660 Tel: 800-878-9593; Fax: 888-878-9593
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