Translations:AY Honors/Pinewood Derby - Advanced/Answer Key/34/en
From Pathfinder Wiki
New wood can be sealed with a grain filler. This is especially important on end-grain, as without a grain filler, the wood will absorb a finish more in this area giving the car an uneven look. It is applied with a brush and then wiped off and allowed to dry. Skip this step if you intend to stain the wood afterwards, as it will not absorb stain evenly.