Water based varnish

[dantontod]

Hi -

I'm currently refinishing this teak (veneer) cabinet. I've decided to use a water based varnish. I brush it on and then use a good quality roller to get a nice even finish.

It's going on great, the product is nice and level, no orange peeling/unevenness etc. The only thing I've noticed is there are some lighter areas (almost white) - picture attached.

Why would this be? Is this just the nature of teak veneer? Did I not remove previous finish adequately?

Any pointers happily received

 

[dantontod]

I stripped the unit with a scraper and then sandee with 180 grit (electric sander), wiping down with methylated spirits afterwards.

 

[pat from Marck]

I stripped the unit with a scraper and then sandee with 180 grit (electric sander), wiping down with methylated spirits afterwards.

Hi I've used water based marine varnish on many occasions what you've described sounds like to much applied in one area as I've had the same problem on several occasions. My advice is let dry sand back and repaint. Or possibly reacting to oil residues left in the wood.

 

[dantontod]

I've posted on another forum and had responses that mention oil from the teak. I'm not sure on your point about me applying too much in particular areas, as the area is quite small and I was able to ensure an even application.

 

[pat from Marck]

I've posted on another forum and had responses that mention oil from the teak. I'm not sure on your point about me applying too much in particular areas, as the area is quite small and I was able to ensure an even application.

Just that I've painted on a little bit more varnish in some areas that gave a difference in thickness which has led to my coat whitening (milky translucent) appon drying.

 

[Mike Fletcher]

I find the water based varnish dries too quickly, giving light and dark spots. Oil based cut 50 /50 with spirits and applies with a lint free cloth works the best for me. It takes several coats, with overnight drying but the finish is superb. Sand between coats with 800 grit and spirits.

 

[kinverkid]

What not to do. When glueing or sealing Teak I will use Isopropanol just to microscopically break down the oil surface. Iso may break down the glue backing on the veneer. I've cannot remember using water-based varnish on teak so I'm just throwing this in as a thought for more experienced members to pick apart. What about cellulose sanding sealer first, rub back then water-based varnish.