Body Work Tutorial

Is this what you are referring to as a filler primers?

4. Poly primer, is a VERY high build primer, most body fillers are polyester based as is this primer. This type of primer is basically sprayable body filler. This is a good primer for leveling an entire car. This primer has the possibility of cracking and chipping because it is so THICK. It does have it's purposes.

5. 2k primer and Urethane primer are usually associated with the same product. A 2k primer is a "two part" primer, basically the primer, and a catalyst. 2k Primers are usually associated with a sandable surface primer or filler primer. The primer is used to fill sand scratches and also help you level bodywork. Dries fairly fast, and usually has a good build of product.