Years ago, I was taught by a former employer to seal everything with 2-3 coats, then sand once and topcoat. That is how I have been doing it for years and never gave it a second thought (using solvents). Now that I am using waterborne finishes, I don't think that system will work. It requires way too much sanding. The other day, I gave some pieces 3 sealer coats and 1 topcoat, and lightly scuffed after each coat, and got a beautiful finish, and I think it was just as quick as sanding only once at the end like I was doing before, since it didn't take so much elbow grease to get it smooth. I am just curious how much everyone else here sands, from the first sealer coat until the final coat.
From contributor T:
I am sure the finish we have been getting comes from sanding between each coat. I have not come across anyone using 2-3 seal coats before the topcoat application. Seems to me your finish is not going to be as hard and may fail at some point.
I know I am on a learning curve when it comes to CV, but with a pre-cat lacquer I have several years under my belt and will stick with sanding each coat, 1 seal, 2 topcoats at 3 mil.
Does this schedule look like too much work, or is this the kind of schedule required to produce a good finish with waterbase?
The only time you should need to use the sealcoat is if you need a barrier between something that may be incompatible with the Aguabarnice or if you want the ambering from the sealcoat. In that case you would spray 1 coat sealcoat and 2 coats of Aguabarnice.
It doesn't matter if you sand once or twice, you still have to take off the same amount of finish to achieve a smooth/flat final coat. Even if you do the flawed "fill method" you will still have to start with 240 grit to remove a bunch of material, then switch to 320.
The one topcoat method is not a good idea either. It is hard to achieve a decent film thickness in one coat. If the finish is self sealing and thick you can get away with 2 coats.