Putty is a filler material that is used to provide a right and perfect level to the surface, and also filler hollows, craters, cracks, dents and imperfections that may contain the surface.
The putty is a compound whose unique function is to fill and repair which after further sanding to get a level and aesthetically correct surface, putty has no protective function or specific to improve the properties of the applied surface, its only function is to achieve level and restore small areas.
The putties must have the following characteristics:
Adhesion - the putty should have an excellent adhesion on metals, plastics, paint coatings and surfaces on which shall be on, for this is necessary to select the correct putty in order to have good adhesion between the substrate where applied and the following layers of coatings.
Filler power - putty must have a high filler power (the thickness of the putty before to curing must be equal to the thickness of the filler after curing) as its main function is filler and repair.
Elasticity - the putty has to be able to withstand vibration and dynamic loads and sudden temperature changes, avoiding that to crack or peel off the putty and subsequent layers of paint.
Easy sanding - The putty is sanded to achieve the desired level, as well as adherence to the following processes of painting.
Low porosity - The putty when dry will not produce excessive pores.
Strength - The putty must have mechanical and chemical strength, in order to resist external effects and agents.
In the market exist in different types of putties, the selection of suitable putty depends mainly on the surface (dimension, material , etc…) on which to apply, and the type of work to be done.
Then you can find a summary of the characteristics of each of the families of putties used in the paint area, which are available on the market:
Standard Polyester Putty - Putty used to fill large areas due to its high filling power, used in the manufacture and repair of commercial vehicles, has the disadvantage of be porous putties.
Fine polyester putty - Used to fill the pores left by the standard polyester filler.
Polyester putty glass fiber - is polyester filler which is added to the glass fibers, particularly suitable for the repair of reinforced plastics, available in high filling power.
Polyester putty for galvanized surfaces - Especially polyester putties designed to adhere to galvanized surfaces.
Putties for Plastics – Are putties more elastic and flexible than standard putties and are specifically designed to work on a wide range of plastics.
Multifunctional Putty - Is a type of putty used in small repairs in body shops, has a fine texture and low porosity, having a good adhesion to a wide range of materials.
Epoxy Putty - Putty formulated with epoxy resins, which are used in the marine industry because of its high resistance to water and chemicals, are putties with little elasticity and with a high degree of adhesion, the main disadvantage its sanding difficulty, due that once dried are materials with high mechanical strength.
The polyester based putty is more widespread and used putty, is a 2-component material (resin + hardener), which have mixed in the proper ratio prior to application.
The principal resin of this type of putty is polyester mixed with styrene, which allows to adjust the viscosity of the putty. The hardener is dibenzoyl peroxide, being necessary a small proportion (3 to 5%) of this product to harden and solidify the putty.
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