Indoff has developed a product to that allows you to temporarily/permanently convert your Magnetic chalkboards (caulk surface over steel) to Dry-erase Whiteboards.   We ship you cut to size porcelain over steel skins (via Truck) and also ship you a magnetic self-adhesive material that you field apply to the back of the porcelain over steel skins.   The porcelain over steel skin with the magnetic backing is then placed on your existing chalkboard and it is held on very tightly by the magnetic backing.   If another teacher prefers the caulk surface you just peel off the whole assembly and store it.    This is a two person operation for a 4' by 8' board so it is not something you would do every day but more by teacher preference.

Projection - P3 is available in a low gloss surface that is designed to Project on!!!!!
Small Sections such as 3' x 3' can also be done this way !