When preparing old metal for painting, any ____________________ ...

[FButt]

When preparing old metal for painting, any ___________________ _ or ___________________ _ left
  will prevent the paint from holding to the metal.

 
  Fill in the blank(s) with the appropriate word(s).

Question 2

Sandblasting is a process that uses compressed air to throw ___________________ _.
 
  Fill in the blank(s) with the appropriate word(s).

[chjcharjto14]

Answer to Question 1

grease, rust
rust, grease

Answer to Question 2

ANS: fine sand particles

[FButt]

Thanks for the timely response, appreciate it

[Joy Chen]

Gracias!