Sanding and sealing MDF
Steps for sealing exposed core areas of medium-density fiberboard. 1998.
by Rick Hill
Q.
What are the recommended methods for sanding and sealing MDF?
A.
The key is to fill the minute holes and lock down the fibers from further raising. We usually try to find MDF made for painting. It is more homogeneous than regular MDF and has less fiber raise on the routed cuts.
First finish sand with 150-180 grit silicone carbide paper. Blow off the substrate after sanding to eliminate dust. (Moisture content of the MDF should be stable at around 6-7%.)
Next, apply our very heavy solid White DuraSyn primer. Spray the routed areas first, let it dry for several minutes, than spray a wet coat over the whole part. Air dry 20-30 min. before sanding. The DuraSyn is a very heavy, high solid primer that was developed for MDF. It really fills the board well.
If it is a clear finish that's being applied, use polyurethane clear finish formulated for both MDF and Particle board.
After it’s dry scuff with 220-280 grit stearated paper and then topcoat.
Rick Hill is an independent representative and consultant for industrial wood finishes. He has been involved in the woodworking industry for 12 years, and has been known to actually hold, shoot, and clean a spray gun.
If you have an industry related question, visit WOODWEB's Finishing Forum to post your question.
Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?
Have you reviewed the related Knowledge Base areas below?
KnowledgeBase: Finishing: General Wood Finishing
KnowledgeBase: Finishing: High Speed Production
KnowledgeBase: Knowledge Base
Would you like to add information to this article? ...
Click Here
If you have a question regarding a Knowledge Base article, your best chance at uncovering an answer is to search the entire Knowledge Base for related articles or to post your question at the appropriate WOODWEB Forum. Before posting your message, be sure to review our Forum Guidelines.
Questions entered in the Knowledge Base Article comment form will not generate responses! A list of WOODWEB Forums can be found at WOODWEB's Site Map.
When you post your question at the Forum, be sure to include references to the Knowledge Base article that inspired your question. The more information you provide with your question, the better your chances are of receiving responses.
Return to beginning of article.
|
