I'm almost finished with a Twin Whistle painted diner. I'd like to do something with powders but the finish is so rough I think it might clunp up and ruin the paint job. The only thing I ever used dullcote on was plastic or metal. The pic won't show it well but the roof is like rough sawn lumber. Main concern is the roof. Could I seal it with something like Mod Podge. If it matters the paint is all acrylic.



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They make a Sanding Sealer in acrylic, if you're so inclined.  Same principle as with the solvent-based stuff....apply coat, let dry, sand, re-coat, sand,.....etc. until you're satisfied with the surface.

Acrylic or solvent varnishes....furniture grade...also works to seal/sand to final surface finish.  Acrylic can be applied over thoroughly dried such varnish/sealer, but not recommended vice-versa.  Also, avoid sanding sealers that are lacquer based, too......for compatibility and/or health reasons....IMHO.

At our store (LHS) acrylic favoring folks would use the sanding sealer found in the Pine Car (Derby) supplies area.  They're a division of Woodland Scenics, anyway.

FWIW, always...



Dullcote is routinely used on wood as a sealer. You glue on bracing to the back of the walls then paint both sides with a base coat enamel like Rustoleunm gray primer then spray dullcote to seal. This stops the wood from warping if you decide to go to acrylics. After that you can use acrylic paints, powders etc then spray again. If you want good 'primers' on building with wood search Youtube for Jason Jenson Trains.

Joe Fauty

Primer/sealers for general painting  can be used to create a paint surface that doesn't absorb a lot of (expensive model) paint. Wood/drywall tend to suck-up a lot of paint.  I've used a Sherwin William PrepRite, ProBlock in spray cans for large wood prep.  It is also sandable. 

Roof of the Roundhouse. 

Another model with the finish roof material. 


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