Just prewet and rinse any over spray and you should be okay.

The stripper is too aggressive for new wood. Temperate is too cold for most stain brands. You have to let the wood weather or the stain will fail:

You have to have a tint for UV protection and the Amber is the way to go for IPE wood.

Stript and brighten all and use the same stain color for both areas so they blend or match. The AC in Amber will give you a better overall color than ...

Do not use a wood filler. It does not work on decks: Also sanding/planing a deck and you should treat like new wood: It would be easier to fully r...

Use the Restore a Deck Stripper and Brightener Kits:

You cannot buff them off once stained. You would have to remove the stain, then sand/buff them off. They do not go away naturally and they do not caus...

Yes, sand it all so the stain takes evenly. Clean and brighten after for final prep to open up the pores.

You will need to evenly sand this so the stain takes evenly. Do all with 80 grit and then apply one coat of the AC.

You can do it now. 60s is a great temp to prep and stain.

We would leave it as is for now. In the Spring, lightly wash the deck with water to remove dirt and apply another coat then.

Do it Spring. Final prep with a deck cleaner and then a wood brightener.

Use the RAD for prep products: Just do it all in the Spring.

The Defy or RAD Stain will work better and prevent the mildew from coming back better.

Behr is horrible: Clean and brighten for prep and try the Restore A Deck Stain or TWP 100 Series. See this for new wood tips: