Fisheye In My Finish Again (and again, and again)!
I like to finish projects. It has taken me awhile to admit it, but I do. I am not scared away by sanding, and I can handle the torment of airborne dust and the occasional trespassing fly. It allows the artistic side of me to come out, and I appreciate how the finish can make my woodworking look better than I imagined.
At the same time, I am beginning to despise working on projects that are already finished, especially repairs, because they can’t come out better than I imagined. All that can happen is that new work doesn’t match the old work, or that I have to refinish the entire piece, or worse yet, I have to refinish the entire piece three times. “Three times?” you ask (maybe even out loud and with a wacky look on your face). Yep, three times. This is a whopper of a fish story – fish(eye) that is.
Last year, I did a job that included taking an antique piece of furniture and making it work as a bathroom vanity. It was a very nice piece, purchased specifically for the space and didn’t require much woodworking. The only request from the customer was to shorten the depth of the upper drawers to allow for the plumbing and to spray the top with a waterproof finish suitable for a bathroom.
Easy enough, I thought. In this situation, I like to spray a product from M.L. Campbell, called Krystal, which is a two-part conversion varnish that is resistant to everything once the chemical reaction is done. And, it has a high solids-content, which means it builds to a thick film quickly. It also has the added benefit of working just like the lacquer that I normally spray and thins with lacquer thinner. The job was going to be especially easy because the piece of furniture didn’t need any repairs or touch-ups that required staining to match the existing color.
I wasn’t sure what the original finish was on the piece, so I did my due diligence and tested the new finish on an inconspicuous spot on the back of the piece. I wanted to make sure that my finish was compatible with the old and that nothing crazy was going to happen. I sprayed over the old finish and it laid down nicely and adhered great. No problemo.
I moved on to actual spraying and shot a coat on the top. It went on like butta’, shiny and smooth. I was going to be done in no time, but… then I looked closer, and I saw some spots, then some more and some more. It was like the oceans parting. The stuff I just sprayed that sticks to everything like glue was jumping off of the surface (not literally) and leaving areas of original finish surrounded by areas of new finish. I didn’t actually hear it, but I expected to hear the Snap, Crackle, and Pop of Rice Krispies. It was demoralizing and memorizing at the same time. I hadn’t ever run into anything like it, but then again, I mostly work on new wood, not old wood.
It was quickly obvious that there was something on the furniture that was repelling the new finish. The good news was that I didn’t need to worry anymore about wrecking the finish, it was already done. Lucky for me, the top could have used a little sanding and it was made of 1-1/4″ thick solid mahogany, so I didn’t need to worry about sanding through the veneer. I decided I was going to show this thing who was boss and jumped on it with my sander. In about an hour I had the whole top sanded to fresh wood, stained it with my favorite dye stains and was ready for a brand-new finish. In no time, I would build up three coats and be all done.
I sprayed the newly-stained, freshly-sanded top with my same favorite conversion varnish and it went on like butta’ again. Then guess what happened? The same thing. Not only the same thing, but the exact same thing. It was no less pronounced than the first time. Now, I was stumped. The first attempt was my fault. I should have cleaned the surface better or been more aggressive in my preparation. But on the second attempt I couldn’t have been more aggressive. There was nothing left but raw wood. I sanded past the old finish, past the old stain, and even deep enough that no original pores were left. It was new wood. Obviously, there was a problem with the finish.
The stuff I was spraying does have a shelf life, though I couldn’t tell you what it is. Also, I have to mix two parts together, so I could have done that part wrong. Or, maybe something else was in there that was throwing off the chemistry. I didn’t know, but I didn’t want to take any chances, so I left for the night to rest, regroup and resupply.
The next day I resupplied at Compi distributors (the best company I have ever worked with in any industry and worthy of their own blog posting) and got to talking about my issues. They have always been helpful and knowledgeable and suggested that the surface probably had wax on it. Duh!, I thought. Of course it had wax on it. I figured that part out. It was old, somebody waxed it, I was lazy, I did nothing about it, and now here I am. But, I did do something about it the second time. I sanded the whole thing down to raw wood. I can’t be any more proactive or retroactive or whatever you want to call it than that. But, James, the finishing expert at Compi, politely said to me that the wax was probably still there, down in the wood, where I couldn’t get to it – even with sanding. He said that he had seen this before and to treat it like wood with wax on it, and he also gave me a little dropper bottle of fisheye killer to add to my finish.
When I got to the job site that day, I first cleaned the top with naptha (which cuts wax) then with lacquer thinner (which may not have done anything, but made me feel better) and then added the fisheye killer to a fresh batch of my same favorite finish.
I sprayed the top and it went on like butta’ again. I stepped back and waited. Nothing. Nothing happened. My finish went on smooth and looked like any other finish I had ever sprayed. I am pretty sure that James was right and the wax was still there and it was cleaned up with the naptha. However, I did start with all new supplies, a clean gun and fisheye killer too, so I am not positive what fixed it, but it was fixed – finally. Now, whenever I work on an antique piece, I always treat it like it has wax on it and clean it with naptha first.