So an additional coat may be in order. So build up coats of gloss poly first.
How To Apply Polyurethane The Family Handyman
How To Protect Painted Furniture With A Top Coat Poly
A little test of how well polyurethane works when there are 40 coats.
How many coats of polyurethane on table top. Apply the first coat and wait for it to dry. Steps for applying polyurethane for a beautiful finish. As far as protection goes you should be gtg with 3 coats.
Heating dropping rocks and chiseling the wood. Standard polyurethane is applied with a brush but there are also wipe on formulas that are applied with a rag as well as a spray finishes in aerosol cans. Fix the blemishes with a razor blade and sander.
I would apply 3 5 coats depending on the openness of the grain and how slick you want the table to look. For the best results youll need at least three coats of finish but you may want to apply even more. You can always put on another coat in a few years if it gets a little rough.
It only took half a quart for this testwith testing there is always waste. If you want to reduce dust nibs thin the last coat of polyurethane by 25 to 50 percent so it dries faster additionally because penetrol is an oil it cant help but weaken the durability of polyurethane though not enough to cause a problem in most situations so far as i can tell. Ensure there is no dust left behind.
If you use a wiping varnish you need to wipe on 2 3 coats to equal one brushed on coat. Then if you want less sheen dull the finish by wet sanding or wiping on a couple coats of satin or semigloss. Its a much better finish especially for a table top application.
Regardless of the type you use if your project will see a lot of wear and tear few finishes are as appropriate as polyurethane for the protective top coats. Of course with something as absorbent as mdf your first coat will be almost completely absorbed. Sand down the wood.
A few coats of semigloss or satin polyurethane looks like a sheet of dull plastic over the wood. Apply a second coat. Allow each coat to dry for an hour or two or until dry to the touch then scuff with 220 grit sandpaper before applying another coat.
Apply a third coat. Apply coats of a rubbing compound and polish.
Handmade Table Tops From Reclaimed Wood Stained In Red Oak 4 Coats
How Many Coats Of Polyurethane On Kitchen Table
How To Get A Smooth Polyurethane Finish The Family Handyman