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General Finishes Pro Image Topcoat can be applied directly to the stain without a sealer.

In cases of species like White Oak top coats can pull tannin from the wood leaving an undesirable color affect. Many closed grain woods such as maple, walnut, and cherry may only require one seal coat and two finish coats. Most open grain woods such as the oaks and ash will need two seal coats to increase the build of the finish and improve the final result. If in doubt, put down a coat of sealer.

Three features differentiate flooring topcoats

1. General Finishes flooring topcoat, Pro Image, is fortified with significantly more urethane to increase durability.
2. The slip rate of flooring topcoats is higher to improve floor safety and reduce the likelihood of slipping; approximately a 5.7 rating. For example, someone in socks is less likely to slip on a flooring finish, or a basketball player is less likely to slip on a good professional floor finish.

There are four benefits to using sanding sealer as the first seal coat prior to topcoat

ENDURO PRO SERIES SELF CROSS-LINKING CLEAR & WHITE POLY  by General Finishes

Get professional performance for a competitive price. This new pair of ENDURO topcoats are tintable, fast-hide coatings for professional and industrial use. The high solids content provides strong build and 2-coat hide when primed with Enduro White Undercoat or General Finishes Stain Blocker.

The hardness properties of a wood finish are formulated around the objectives of use. A hard finish is desirable on projects that get heavy wear such as kitchen cabinets or table tops.

But in other situations, such as an outdoor topcoat, a desired property of the finish is elongation, which allows the topcoat to expand and contract through different extremes of temperature.

All bright white paint will yellow slightly with time, even without topcoat. You have probably tried to touch up white woodwork in your home after several years and noticed that the new paint is brighter.

But white and light paints can react if clear coated with a waterbased finish; water-based topcoats are reactive and may draw out substances in the wood such as tannins, dyes or unknown substances in existing finishes causing the topcoat to yellow. This is an industry-wide issue and can happen right away, years later or never.