Hi all. I am hoping somebody can offer some advice....
I a building an airplane (aluminum) and have been spraying PPG DP48LF on the internal structure as a primer/sealer solely for the sole purpose of corrosion protection (sealing). I have been using a cheap 1.0mm touch-up gun with decent results, but the gun has recently developed bad habits and I am considering the purchase of a new higher quality gun.
A friend said I should consider moving up to a 1.4mm tip for the DP48, which PPG also recommends. However, the 1.4mm guns I have found require around 10cfm or more, and my 5HP compressor is only rated at 6.6cfm @ 40. That being said, I am not sure how much of a factor that should be as my spraying involves a lot of small parts, meaning unlike a car there is a lot of starting and stopping. I also need to be careful to not spray too much primer as it adds a lot of weight. I only need a very light coat of primer as these parts are not getting top-coated.
With all that in mind, would you recommend moving up to a 1.4mm tip or would you recommend staying with a 1.0mm tip?