Advice on prepping old wood windows
I need to strip, prep, and paint two exterior window frames and sashes before new storm windows are attached.
I have the stripping plan worked out - a combination of scraping, sanding and chemical stripping with Smart Strip. I'm going to repair one area of rot on one sill with MinWax Hardener and Woodfiller, but otherwise it all looks pretty sound.
My question is what to do to the bare wood. The 90 year old window sashes have deep horizontal grooves in the bottom section of wood. I don't know the term for this and don't know what to do about it.
For painting, I was planning to use Kilz Premium exterior primer and then a high quality paint.
But what do I do about the grooves? I'm not equipped to remove the sashes, so this is being done in place.