It has been shown that conventional
water repellent when applied to wood
lose their bond strength on weathering
(Voulgaridis 1980). It suggests that the
bond formed between wood and conventional
water repellents may lead to easy
detachment of the deposit from the cell
wall during exposure to weather If the
loss of effectiveness associated with the
above effect is significant, the use of water
repellent substances, able to form stronger
bonds (e. g. H-bonds or covalent bonds)
with the cell wall, may lead to enhanced
long term performance.