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Primer application with Accuspray™ guns

Accuspray™ System HVLP Primer Gun

The revolutionary design of the Accuspray™ System HVLP Primer Gun from 3M provides the finish of a premium HVLP (high volume low pressure) primer gun at a fraction of the cost. Thanks to the replaceable atomizing head, it’s like spraying with a brand new gun every time you use a new head. A range of atomising heads is available to match the right product of your choice.

This innovative Accuspray™ System gives you:
- A lightweight and comfortable primer gun
- Reduced overspray
- Optimal fan pattern
- Lower primer consumption and optimised coating thickness
- A flatter, smoother finish which cuts down sanding time
- Cleaner gun and fast change between primer shades
- Quick and easy cleaning with reduced solvent use
- Use the 1.4 mm head for wet-on-wet primer, 1.8 mm for standard primer and 2.0 mm for sprayable body filler

Step by Step Guide - Primer Application Process

Safety First!

Always select appropriate Personal Protective Equipment - Eyewear, gloves, hearing and respiratory protection for your job and workplace!

Step 1 - Prepared vehicle

- Vehicle roughly masked.
- Repair area prepared for primer application (P320 - P400 sanded).

Step 2 - Cleaning of the surface

- Degreasing of the surface with special cleaner - please observe the recommendations of paint manufacturer
- Cleaning the surface prior to primer application with Tack Cloth Aqua PN50410.

Step 3 - Preparation of the primer

- Different PPS™ sizes allow for on demand mixing of the primer.
- By using PPS™, no additional mixing cup is needed. Refilling of the primer into the primer gun is not necessary.
- Integrated filter. No manual filter process necessary. (Use 200 my for standard primer and 125 my for wet-on-wet primers).

Top Tip

Do use the primer shade recommended by your paint manufacturer! PPS™ allows for the quick change between different primer shades.

Step 4 - Assembling the Accuspray™ gun Modell HG14

- Pull trigger.
- Press atomising head (1.8 mm for standard primer, 1.4 mm for wet-on-wet primer) onto body until it firmly locks into place.
- Release trigger.
- Turn gun upside down and connect to PPS™ cup.

Setting and adjustments of the gun
- Maximum inlet pressure: 4.5 bar
- Maximum spray / operating pressure: 1.38 bar
Adjustments:
- Adjust the fan size with the upper knob
- Adjust the volume with the lower knob

Step 5 - Primer Application first layer

- PPS™ allows for primer application from different angles without dripping.
- Edges and wheel arches can thus be coated safely.
- Please do observe the recommended layer thickness!

Step 6 - Flash off

- Please do observe the flash off times recommended by your paint manufacturer!

Step 7 - Primer Application second layer

- Using the 3M Accuspray™ gun allows an even and clean spray pattern.
- The Primer flattens itself easily and thus cuts down on sanding time and effort for maximum productivity gain.
Change your Accuspray™ atomising head regularly to always achieve the cleanest fan pattern.

Step 8 - IR drying

Please do observe the recommendations of your paint manufacturer concerning:
- Object temperature
- Drying time
- Distance of the heater from the object

The quality of drying has a positive influence on the later sanding properties of the primer. IR drying accelerates the repair process and at the same time ensures an even drying of the primer. A well cured primer is easier to sand.

Step 9

Cleaning of the primer gun
- The short pot life of the low-VOC primers require an immediate cleaning of the gun.

Disconnect the air line, turn the gun upside down, pull the trigger to relapse air into the PPS™ Cup. Remove the PPS™ Cup.
Remove the atomising head from the Accuspray™ gun by pulling the trigger, then disconnecting the atomising head. Release trigger.
Clean the tip of the Accuspray™ needle with a clean panel wipe to remove any primer residue.
Dispose of the used atomising head and replace with a new one (to protect the fluid needle).

Tip:

Change your atomizing head regularly to preserve a clean spray pattern.

Click here to enlarge the diagram.