East Marine Asia Blog

How To Kill The Mould, Bacteria, and Viruses Naturally

How To Kill The Mould, Bacteria, and Viruses Naturally 1

Mould and mildew can be annoying at hot and humid countries, they are very difficult to clean and they seem to be permanently stay at that place although we visually clean it off with vinegar as well as some commercial products which claim to be “Mildew Remover”.

There are 4 type of “Problems” which related to mould:

  1. Allergies and respiratory illnesses;
  2. Sick building syndrome;
  3. Unsightly stains and odours;
  4. Corrosion and increasing energy costs.

(1)  Allergies and respiratory illnesses

Mould can be dangerous to your health, even if you aren’t allergic.  Many people react to mould by getting tired and even depressed, according to some study.  Mould spores in the air we breathe, it can exacerbate the symptoms of allergies including wheezing, chest tightness and shortness of breath.  Other symptoms may include runny nose or nasal congestion, eye irritation, cough or congestion, fatigue and headaches.

(2)  Sick building syndrome

For 20 years, the World Health Organisation has recognised Sick Building Syndrome which is associated with allergenic and respiratory problems affecting people in fully air-conditioned buildings.

Chronic headaches, runny nose, sore eyes, fatigue and respiratory disease are just some of the problems caused by high dust loadings, poor ventilation and biological contaminants such as mold and bacteria.

(3)  Unsightly stains and odours

Hot & Humid or Cold & Damp are the perfect environments to “grow” mold and bacteria.  This often leads to mould growing in carpets and upholstery, unsightly stains on walls and ceilings, and unpleasant odours which make people feel very uncomfortable.

(4)  Corrosion and increasing energy costs

Another “unforeseen problems” which cause by mould directly in air conditioning coils and ducts are inefficient heating and cooling, increased corrosion of the coils, ducting and air outlets, and increased in energy cost.

Tea Tree Oil

Tea Tree Oil is an essential oil which is known around the world for its “Incredible Sterilising Properties” (removal or killing of all forms of microbial life present including transmissible agents such as fungi, bacteria, viruses, spore forms and etc).  The sterilising properties of Tea Tree Oil are present both in the oil and in the vapour (tiny particles of the oil which have become airborne).

Tea Tree Oil has a unique characteristic odour which most people describe as “fresh” and “clean”.

Melaleuca_alternifolia_(Maria_Serena), Source: Wikipedia

Gelair (Australia) has delivered solutions to mould and bacteria build up in buildings for a decade.  Australian grown and distilled Tea Tree Oil is the main ingredient in Gelair products.  Gelair uses only the finest Tea Tree Oil in its products, with every batch meticulously tested for quality.  Australian Tea Tree Oil is a powerful broad spectrum anti-microbial and anti-fungal agent, capable of killing mould, bacteria (including Legionella) and viruses.

One of the flagship product which offer by Gelair is Gelair Air Conditioning Blocks (Gelair AB).  They are used in high air volume and high air flow areas such as the air handling unit (AHU) or air conditioning systems to sterilise and sanitise the whole air conditioning system and effectively stop the spread of invisible mould, bacteria and viruses by treating all air entering and leaving the AHU.

Gelair AB

Gelair ABs consist of a specially formulated and patented gel matrix block impregnated with Tea Tree Oil.  The gel matrix provides the controlled and sustained release of high quality Australian Tea Tree Oil vapour for 4 to 6 weeks.  Once released, the vapour permeates through the entire air conditioning system, sterilising and sanitising the AHU supply ducts, return ducts and diffusers of the air conditioning system. The released Tea Tree Oil vapour also treats all the air passing through the air conditioner and into the building effectively stopping the spread of invisible mold, bacteria and viruses (including Legionella).  This is call “360° TREATMENT”.

Gelair AB Block in AC

The sterilising and sanitising properties of the Gelair AB continues for the entire life of the Gelair air conditioning block due to the superior ability of the gel matrix to control the release of specific concentrations of Tea Tree Oil vapour over a long period of time.

Gelair AB in AC

You can refer to this link to determine which Gelair AB size is suitable for you.

There are also different of “mould solutions” which offer by Gelair

  • For built-up grime in the AHU, use Gelair Coil and Duct Cleaner.
  • For serious mould infestations, treat first with Gelair Fogging Solution.
  • For Split or Reverse Cycle Air Conditioning Systems, use Gelair Health-e SPLIT.
  • For small volume, small flow areas such as bathrooms, use Gelair Tub.
  • For cars, use Gelair Health-e CAR.

You can refer to more Gelair products at this link.

Gelair All Products

Topcoat vs Gelcoat

Topcoat vs Gelcoat 0


Famous paint manufacturers like Awlgrip, manufactures two different type of resin bases for urethane topcoats.  Awlgrip, which is a polyester urethane, and Awlcraft 2000 is an acrylic urethane.  Polyester molecules are much smaller than acrylic molecules.


A given volume of polyester resin contains many more molecules than the same volume of acrylic resin.  Thus, the polyester has more reaction sights than the acrylic.  This means that Awlgrip topcoat is the choice where harness is important (for example, resiting fender wear, deck areas, and etc) and maximum resistance to chemicals is necessary.  When both are fully cross-linked, polyester form a tighter, tougher film.  A denser cross-linking provides a harder, more abrasion resistant film with better chemical resistance.

Having a different cross-link structure than Awlgrip topcoat, Awlcraft 2000 cures faster which helps application in certain harsh environments.  The faster cure rate makes it the preferred choice if metallic finish is required.

High cross-link density also yields a rigid film.  In today's marketplace there is a need for both polyester and acrylic urethane technology.  Both will resist staining and provide long-lasting gloss.

Application characteristics, chemical and stain resistance, repair-ability and cure times all need to be considered when choosing a urethane products.

Benefits of Topcoat (Awlgrip & Awlcraft 2000)

  •  Excellent chemical and abrasion resistance;
  • Provides a durable finish with excellent gloss hold out and DOI (distinction of image);
  • Awlgrip can be applied by spray or brush / roll;
  • Outstanding colour retention;
  • Great resistance to UV degradation (for example: yellowing) and salt erosion;
  • Custom colour available through Awlmix system;
  • Superior flow-out;
  • Provides a smooth and dense film for easy maintenance;
  • Will prolong the aesthetic appearance of a fibreglass boat;
  • Compatible with a range of Awlgrip primer systems.

 Limitations of Topcoat 

  • Use above the waterline only (not for continuously immersed substrates);
  • Topcoats recommended for professional application only;
  • Repairs is usually carried out by professional applicators only;
  • The extreme gloss can highlight any imperfections in the surface underneath.

  Link: Awlgrip & Awlcraft 2000



Gelcoat is made of a polyester resin although different to a paint in its chemical composition.  It's a thick material used during fibreglass boat construction to achieve a durable, cosmetic finish.

The gelcoat is applied as a thick coating in the mold.  Once lamination is complete, the hull is removed from the mold.

In order to remove the mold, release agents are used on the mold surface prior to application of the gelcoat.  Mold release agents vary but often consist of wax.  A product like gelcoat builds thick layer and with a high pigment load, the coating is slightly porous.

This porosity will become worse over time as the resin layer wears away and exposing the remaining material to UV degradation, resulting in a chalk-like finish as oxidisation occurs, and discolouring.

Coloured gelcoats are prone to degrade faster than white gelcoats due to the natural light reflectance in white pigments like titanium dioxide.

Benefits of Gelcoat

  • Less gloss (minor scratches don't show as easily);
  • The softer polyester resin allows for easy buffing and polishing;
  • Offers a smooth surface for paint;
  • Gelcoat repair kits are widely available, at a reasonable price.

Limitation of Gelcoat

  • High maintenance (requires polishing with abrasive materials and waxing to prolong a glossy surface), this will be more at tropical countries due to higher temperature;
  • Years of high maintenance reduce the thickness of the resinous layer at the surface, increasing the amount of maintenance needed to maintain gloss;
  • Colour choice limited (including colour choice of repair kits);
  • Gelcoat repairs can be labour intensive as the surface must be sanded and polished again;
  • Porous surface is difficult to clean, especially around exhaust pipes, waterline and non-skid decks without using chemicals.  This includes water spots;
  • Softer resin system means more fragile, so may spider and chip more easily.
Free Rocna Cap At East Marine

Free Rocna Cap At East Marine 0

Get your free ROCNA cap if you send us your photo(s) with your "lovely" Rocna or Vulcan.

Please send to us via email at sales@eastmarineasia.com, and include the following information as recording purposes:

Subject: Free Rocna Cap

  • Your Name
  • Vessel Name (model, year, length & weight)
  • Year of Rocna / Vulcan purchase
  • Where you buy your rocna / Vulcan

And you can collect the FREE Rocna cap from one of our shop (Phuket Boat Lagoon or Ao Po Grand Marina)

You can also instruct us to send to you via post, extra postage fees will apply.

Be quick while stock last.

If you haven't own a Rocna / Vulcan yet, please feel free go to this page to have look.

New EM Blog Coming Soon

New EM Blog Coming Soon 0

Welcome to Marine Parts Asia / East Marine's all new website, which EM Blog is part of the "new feature".  Please stay tuned as we will be putting more articles, help files, advises, and etc.

At the moment, please feel free to browse thru our products page.  Remember, we are keep improving the content of this site, so please always come back to check out the new products.


First tip for the "first" next post : Topcoat vs Gelcoat