Absolutely! It makes for a great finish. Dilute 20 percent. 1 oz water for every 4 oz paint.

For painting on a sealed wood (craft dollhouse) does the surface need to be sanded or primed?

The final finish always looks better and last longer when you use a primer. Depending on the size of the Dollhouse, you may want to consider spray paint.

Has anyone used this on a exterior brick wall? I need to stain a single brick face i'm patching with mortar ...

Yes, you can use it on metal, concrete, stone, brick, wood, plaster, sheetrock etc. They also have a rustoleum primer that will cover any surface except maybe plastic. They have another product for plastic.

Can this primer be used on painted drywall as a chalkboard paint base?

We would suggest the following item, it is also made by Rust-Oleum: Rust-Oleum 2004 Zinsser Bulls Eye 1-2-3 White Water-Based Interior/Exterior Primer Sealer, 1-Quart

Brand	Rust-Oleum
Model Number	1964502
Product Dimensions	12.7 x 12.7 x 12.7 cm; 998 g
Color	グロスコロニアルレッド
Material	水性
Laser Class	水洗い可能
Included Components	1
Are Batteries Included	No
Paint Type	エナメル
Item Weight	998 g

Rust-Oleum 1964502 エナメル塗料 クオート グロス コロニアルレッド 32液量オンス

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Rust-Oleum 1964502 エナメル塗料クオートグロスコロニアルレッド 32液量オンス