The Falls City tribune., 1911-01-06

E@A = NH' 49, ~
ence of worth, the evidence that the
oil is in the paint.
Every blister is caused by some
thing in the wood that expands and
lifts the oil film off. 1t may be wa
ter, it may be pitch or sap but it is
always in the wood and the paint that
blisters is the one that is thick in lin
seed oil, the one that is protective to
the wood.
II is sometimes hard to account
for the location of blister. We a
not see the moisture but 1t is there.
Perhaps n tree shades a few spots
so they do not dry, after a rain, as
the rest of the surface does. Or a
soft spot in the lumber retains the
moisture longer.
There is no need to look in the
paint pot for the cause of blistering.
1t is not there,
Nor need We look in the paint for
the cause of peeIing. The causes
are much the same as for blistering.
Something in the wood lifts OF pushes
the film from the surface. The peel
ing proves that the film is good.
We can not peel anything that is not
film like. The hard husk or film
must be strong enough to hold togeth-
or or it will not peel, it will break
and crumble. So here again we have
convincing evidence that the paint
is good.
The cause is usually moisture-eoY-
ering considerable surface, but it
may be a pitchy place where the
pores of the wood are filled with It
sc the oil can not penetrate. such
places must be well coated
with shellac.
There is a tendency to begin work
too quickly after a shower or heavy
rain and a spot that is shaded will
not dry as quick as the rest of the
surface that is exposed to the sun.
ofeourse what l have said applies
To new wood. If the printing coat
goes on right there will be little
trouble about subsequent coats. There
fore watch the printing coat.
The lumber we use now is respons-
ible for much trouble with paint.
White pine and poplar are soft and
porous and the oil takes firm hold;
but the days of white pine and poplar
are nearly numbered. They are ex-
pensive and we must use Washing
ton fir, southern pine. spruce, or
cypress. All these are hard nuts for
the painter to crack, They are full
of troubles.and rosin. and linseed oil
and rosin are not friends. They
will not unite except when boiled to
gether. But turpentine and rosin are
"kith and kim They have the same
%parentage. Therefore the printing
coat for rosin and pitch soaked lum-
Der must contain an excess OF tur-
pentine. Our best efforts will fail
sometimes for the sun draws this
resinous pitch to the surface and the
paint has to come too, Any paint
that isn't as full of holes as a porous
plaster will have to yield.
When paint peels over old work
it is the old work that is at fault
II it isn't fast and solid it will loos-
en- and give way when the new coat
contracts and expands. as it must
before it hardens entirely.
Scrape it off or burn it off. Leave
nothing that can be detached.
| have already explained why paint
"ehalks.' Do not be niggardly with
linseed oil in putting on the last
coats.
There are two causes for cracking
or as it is usually called checking
one is too much zinc. l do not think
much of zinc for outside work. 1t
covers more surface than lead, pound
per pound and for that reason mixed
paint men use it, and make it a talk
Ing point as being better than lead.