Most
leather used for automotive upholstery has a finish applied that comprises a polyurethane protective layer and an abrasion
resistant topcoat.
Polyurethane is a polymer composed of a chain of organic
units joined by Ethyl carbamate (urethane) links; the polyurethane used is
categorized as an elastomers; it has elastic properties while maintaining some
rigidity. It is semi-permeable and has micro pores that allow hydration
(transpiration and evaporation of moisture); otherwise it would become less
supple and the finish will be subject to cracking.
Leather is hygroscopic (naturally absorbs and retains
water), meaning it’s also susceptible to losing the moisture necessary to keep
it pliant and soft. The denaturing process of leather tanning removes moisture
from the hide; water-based products restore the lost moisture of leather hides
to maintain its natural flexibility
‘Cardboard hard (Finished
or Unfinished) Leather
Is a certain
indication that the leather has been allowed to dehydrate. The corium is packed
with collagen protein fibres, arranged in larger bundles and interwoven to give
the structure great strength, excellent elasticity and durability.
In the
tanning process these fibres and impregnated with collagens and polymers that
are designed to hold them together and keep them supple. Much of the suppleness
of leather comes from its moisture content. After tanning the skin is protected
with a thin pigmented (colour) urethane and then a clear topcoat.
When
corium fibres lose moisture they shrink, when they are hydrated with water
moisture they swell. The best way to care for finished leather and to keep
wrinkles to a minimum is to keep the leather properly hydrated and avoid, as
much as possible, these shrinking and swelling cycles. Keeping leather hydrated
only requires a regular wipe down with a damp cotton towel.
To
restore the suppleness to finished leather apply Leather Master™ Soft Touch to a clean surface - this is not a conditioner per se but is used
to improve and maintain the tactile feel and lustre (Patina) by rehydration and
to ensure the leather remains matte, soft and supple.
Apply a
small amount to dry 100% cotton micro fibre towel, allow to dwell for 20-30
minutes and
then wipe surface with a dry 100% cotton micro fibre towel. For revitalizing
older leathers and also to improve the feel of stiff leathers it’s better to
apply several thin layers than a heavy application
Hydration
Ensure
that the surface of the finished leather is clean and dust-free. Fill a fine
mist atomizer spray bottle (Kwazar Mercury Pro) with distilled water; lightly
mist the surface and then using a damp 100% cotton towel wipe the surface
I hope the above article was informative. By
having some understanding of the ‘What’ and ‘Why’ as well as the ‘How’ along
with a little science to help you understand how the chemicals we use react,
you can achieve the results you desire.
Questions and/ or constructive comments are
always appreciated
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