PAINTING TIN ROOFS.
When paint scales from a tin roof it is not always the fault of the paint. It stands the painter in hand to carefully examine a new tin roof before painting it. When the tinner uses rosin as a flux to make his solder flow, the rosin is melted and cools again on the tin. When such is the case, carefully scrape it off with a knife, otherwise it will be liable to scale off, and take the paint with it.
When acid is used in the place of rosin it is apt to corrode the tin, hence it is best, if you want a permanent job, to clean off the acid. To do this, first rub the seams with kerosene oil, then wash with soap suds and rinse with clean water. If the roof is quite new, and the tin feels greasy, go over it with a wash made of one pound of sal-soda to six quarts of water, let it stand one-half day; then wash the tin with clear water.
Instead of this method, I have given new tin a good rubbing with No. 1 sandpaper to make it hold the paint.