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AC service · Protection

AC coil coating: when and how to protect coils from corrosion

Coat AC coils in coastal, industrial or highly polluted sites, where salt and acidic air corrode fins and copper. Clean the coil first, let it dry fully, then spray Aerosure Coil Saver Coil Protector evenly over the fins as the label directs. Use Aerosure Clear Coat Spray on exposed metal parts and connections.

By · Reviewed by the InnovaChem technical team · Updated

Product
Aerosure Coil Saver 400 mL
When
Coastal, industrial, polluted sites
Before
Clean and dry coil
Also
Clear Coat Spray for metal parts

When to coat

  • Coastal cities, where salt air reaches the outdoor unit.
  • Industrial areas with acidic or sulphur-laden air.
  • Kitchens and sites with oil and solvent vapour.
  • After a full coil clean, when the fins are clean and dry.

How to apply

  1. Clean the coil with Aerosure AC Foam Cleaner (indoor) or AC Coil Shining Concentrate (outdoor).
  2. Let it dry fully.
  3. Shake Aerosure Coil Saver and spray evenly across the fins, as the label directs.
  4. Let it cure for the time on the label before restarting.

Step by step

  1. Clean. Clean the coil with the right Aerosure cleaner.
  2. Dry. Let the coil dry fully.
  3. Coat. Spray Aerosure Coil Saver evenly across the fins as the label directs.
  4. Cure. Let it cure before restarting.

Products used

Quick answers

Should I coat a new AC coil?

In coastal or industrial sites, coating a clean, dry coil slows corrosion of fins and copper. In clean inland air it is usually not needed.

Do I need to clean the coil before coating?

Yes. Clean the coil fully, rinse, and let it dry. A coating sprayed over dirt or moisture traps them against the metal and does not bond.

How often should a split AC be serviced?

The US Department of Energy advises cleaning or replacing filters every 1 to 2 months in the cooling season and checking the indoor coil every 12 months. Coastal and polluted sites need checks more often.

Sources

  1. Institute of Corrosion: Recognising hidden formicary (ant nest) corrosion

Related on InnovaChem

AC service guidesFormicary corrosion in AC coils: causes, signs and preventionHow to clean an AC condenser coil (outdoor unit)How to clean a split AC coil with foam: 4-step SOPWhy is my split AC not cooling? A technician’s checklistHow to find an AC gas leak before rechargingHygiene glossary

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AC maintenance numbers to know

Published guidance for room ACs. Follow the AC maker’s manual and the product label.
WhatTypical range
Clean or replace filtersEvery 1 to 2 months in the cooling season, sooner in dust [source]
Energy saved by a clean filter5% to 15% less energy than with a clogged filter [source]
Check the indoor (evaporator) coilEvery 12 months; clean when dirty [source]
Drain lineClear it at each service so water cannot back up [source]
Star labelCompare models by BEE star rating and ISEER [source]

What are the signs an AC needs a service?

  • Weak or uneven airflow from the indoor unit.
  • A musty or sour smell when the AC starts.
  • Water dripping from the indoor unit or a full drain tray.
  • Ice on the indoor coil or the copper pipes.
  • The AC runs longer to reach the set temperature, or bills go up.
  • New rattles, hissing or buzzing from either unit.

What should be in your service kit?

  • Gloves and eye protection
  • Coil foam cleaner and a spray bottle of clean water for rinsing
  • Soft brush or vacuum for loose dust
  • Fin comb for bent fins
  • Drain bag or sheet to catch runoff
  • Wire or blower to clear the drain line
  • Torch, screwdriver set and a way to confirm the power is isolated

Carry the product SDS on your phone and follow the AC maker’s manual for the unit you are servicing.

Related reading

Standards and references

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