Replies

1. 
   scott_bonder | Mar 28, 2000 02:33pm | #1

   *
   Oxaclic Acid (spelling??) is a crystal bleach that takes water stains out of wood. It only comes in crystal form. There are three types of bleach and this is the one that takes out water stains. Don't just pick up something that says "wood bleach"

1. 
   Robin_Oliver | Mar 29, 2000 09:17am | #2

   *Than for the reply, Scott. I was speaking with a friend down in New Mexico a bit earlier this evening and he made the same recommendation. He's been building his own adobe home down in Twos and laid down Aspen planks in a traditional herringbone pattern over his beams. He told me that he had the very same problem. He covered his ceiling with plastic during a downpour but it leaked...He added a bit more wisdom, though: oxalic (this is the way he spelled it off the bottle) acid has to be sanded down after it has been applied and dried. He sprayed a polyurethane finish over an unhanded test patch and the finish turned milky...

1. 
   Kees_Repelius | May 05, 2000 04:08pm | #3

   *Would this oxalic acid treatment also work for oak?I am having big black stains in oak boards that I like to remove, it is in the wood and a "wood bleach" did not cure the problem.I think it is weathering, but it may also be black mould.Any experience here?