What happens if I skip sanding and priming when painting oak cabinets in my NB home?

Skipping sanding and priming on oak cabinets is the most reliable way to ruin a cabinet painting project — within weeks or months you’ll see the paint peeling, yellow-brown bleed-through staining your new colour, and a finish that chips at every touch.

Oak has two specific properties that make it particularly unforgiving if you skip prep. First, oak has an open, pronounced grain texture — unlike maple or poplar, which are smoother — meaning the surface has tiny pores and channels that need to be raised, sanded smooth, and filled with primer before they’ll accept a topcoat evenly. Paint applied directly over unsanded oak without primer sits on top of the varnish or stain layer without mechanically bonding to it. It looks fine at first, but the moment the cabinet door flexes, gets bumped, or gets exposed to steam or humidity (common in NB kitchens and bathrooms), the paint releases from the underlying finish in sheets or flakes. In NB’s climate with cold winters and humid summers, this cycle of expansion and contraction accelerates the failure.

The second problem is tannin bleed-through. Oak contains high levels of tannic acid, and when you apply a water-based paint directly over it (even over existing varnish), the tannins can migrate up through the paint as it dries, leaving yellow-brown stains that look like water marks or rust spots — usually appearing in circular or ring patterns. This is especially noticeable when painting oak a light colour like white, cream, or light grey, which is the most common upgrade in NB homes right now. No amount of additional topcoat covers this bleed-through once it’s happened — you must go back, apply a proper stain-blocking primer (Zinsser BIN shellac-based is the gold standard for tannin bleed), let it dry, and repaint. That’s double the work and double the cost.

What happens without sanding specifically: The existing varnish or lacquer on your oak cabinets is a glossy, slick surface. Primer and paint need micro-abrasion — tiny scratches created by sanding — to grip mechanically. Without it, even a good primer will eventually delaminate. You may not see it immediately, but within 6 to 18 months in an active NB kitchen or bathroom, the finish will start lifting at edges, around handles, and on the corners of doors where wear is greatest.

The shortcut that costs more: Many homeowners see YouTube videos or DIY blog posts suggesting liquid deglosser as a substitute for sanding. While liquid deglosser can reduce sheen on a previously painted surface, it does not adequately prepare oak’s open grain structure for cabinet painting. It’s a supplement, not a replacement. On oak, physical sanding — working with the grain with 120 to 150 grit, then finishing with 220 — is necessary.

If your NB home has oak cabinets that you want to paint, do the prep properly: clean with TSP degreaser, sand with the grain, apply Zinsser BIN or a dedicated bonding and stain-blocking primer, sand again lightly after priming, then apply two coats of a quality cabinet paint. Done right, the job lasts 8 to 12 years. Done with shortcuts, it fails within one to two. The prep work is not optional — it is the job.

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