About a year and a half ago I installed a pinewood deck. It was finished with a decking oil. The problem is the sap.I used turpentine and a scraper to remove it, but a week later some of it returns. In fact 10 minutes after removal, signs of it reapear. The deck gets half a day of intense sun--I guess this accelarate the problem.

Will this happen continuasly ?

Is there a one-shot treatment ?

Thanks.