I'm using an epoxy filler to fill countersunk holes and I would like to use white lacquer as my finish. After the lacquer has been applied the filled holes telegraph very clearly. We checked them after the sanding stage and the surfaces were as flat as glass. Can anybody help?
From contributor A:
Did it shrink after the primer? If so, canít you refill them again before the topcoat or primer again? Have you given the filler enough time to dry, and then sanded it after that? It always shrinks for me after filling a wide crack and I do fill again, sometimes up to three times. If it shrinks after the primer or basecoat I fill it again or just do some repairing after the finish topcoat.
1. Using two materials side by side that have drastic differences in hardness (epoxy vs wood)
2. All plastic resins (epoxy, polyester, catalyzed varnish, etc.) take a very long time to fully cure. Polyester can take up to a year to fully cure.
It is much more obvious on large flat surfaces like boats and cars. On boats you can actually see the fiberglass cloth print thru 5 coats of epoxy paint and 1/16 of filler.
Nitrocellulose (NC) Lacquer
Depending on the selection your local suppliers have, you may have the option to use any of them. They all should have a primer/sealer available within the same brand.
Choose between them based on the properties you want:
May or may not need a catalyst depending on the brand. A catalyst is used for improved durability and increases the health risks while spraying.
Moderate durability. Tends to yellow with time. Easy to use. Lower solids content requires extra coats.
More durable than NC lacquer. Also easy to use.
Better hardness and/or solvent resistance than pre-cat. Must be catalyzed and used within a specified time frame (often 8-12 hours).
Overall durability is better than any of the lacquers. Must be catalyzed and used within a specified time frame (often 8-12 hours). High solids content allows for fewer coats.
Overall durability is better than conversion varnish. Must be catalyzed and used within a specified time frame (often 3-8 hours). High solids content allows for fewer coats.
They're all user friendly in my mind. What choices do your local finish suppliers have? What's wrong with the lacquer you're using? Are you using a primer/sealer?