Metal Etching Primer – applying the first two coats
Ambient temperatures influence the application of Propspeed and the set times of the metal Etching Primer and Clear Coat. We recommend a minimum temperature of 8 degrees celcius. In hot conditions never apply the product in direct sunlight or in humidity above 85%.
Open the can of Etching Primer. The yellow pigment in the bottom of the can must be thoroughly mixed before adding the Etching Primer Hardener. This can be done quite easily using the mixing stick provided. This usually takes no more than two or three minutes.
Note: failure to thoroughly mix the Etching Primer Base may lead to premature hardening, inconsistencies and short life expectancy of the final coating system.
Once the Etching Primer Base has been thoroughly stirred and there are no solids left in the bottom of the can you can now add the bottle of Etching Primer Hardener to the Etching Primer Base.
The Etching Primer can be applied using a brush and or foam roller.The application process must be well planned due to the quick re-coat times between coats. The timing of each coat is essential to enable the required chemical bonding between coats. When applying Propspeed, be aware of the area to be coated and the recoat window. You may have to apply the Etching Primer and Clear Coat one section at a time.
The Propspeed system requires two generous coats of Etching Primer. If moving the prop, be careful not to damage the fresh coating.
When coating the blades of the propeller remember to start in the hub area and work your way out to the end of the blade. Once you have applied the first coat of Etching Primer wait approximately 3 to 5 minute before applying the next coat. To test if it’s ready, use the dry-to-touch test method.
What is the dry-to-touch test method?
Take your gloved index finger and touch the wet Etching Primer. If it leaves a small print on the primed surface but no Etching Primer transfers to the fingertip of your glove, you can begin applying the next coat. The wait-time between coats of Etching Primer is very important and must be adhered to. Make sure you have some idea of how time is progressing.
Using 27 degrees celcius as a benchmark you have 3 to 5 minutes from the start of applying the first coat of Etching Primer to the start of applying the second coat of Etching Primer.
Cooler temperatures will lengthen the recoat time between the two coats, and warmer temperatures will shorten up the recoat time between the two. Know what the ambient temperature is when starting.
The same 3-5 minute rule applies between the second coat of Etching Primer and the Clear Coat. Be sure you are ready to move onto step #5 immediately.