Many of us BARS did not prime our rockets on our first round of rocketry back in the 60's, 70's etc. I never noticed any paint flaking off or other problems that I would associate with not using primer.
My understanding is that the main purpose of primer is to help paint adhere to surfaces that it normally would not stick to very well. Metal comes to mind.
Paint sticks to paper and wood just fine. Some of our paper is covered with glassine, and the wood many have some CWF on it, but paint seems to stick to glassine well (see 1st paragraph). My CWF instructions mention painting, but not priming. I assume it is a paintable.
I use a light coat of primer to detect any grain that may have been missed after several coats of CWF. If it looks good, I paint. If it doesn't, then I sand it off and put on more applications of CWF. It's an inconvenient truth that paint does not cover, it colors. In fact sometimes it makes mistakes stand out. Thus, my techinque.
Other than this I am considering abandoning using primer on wood and paper (even with glassine) unless someone can come up with some good reason(s) to use it one these materials.
My understanding is that the main purpose of primer is to help paint adhere to surfaces that it normally would not stick to very well. Metal comes to mind.
Paint sticks to paper and wood just fine. Some of our paper is covered with glassine, and the wood many have some CWF on it, but paint seems to stick to glassine well (see 1st paragraph). My CWF instructions mention painting, but not priming. I assume it is a paintable.
I use a light coat of primer to detect any grain that may have been missed after several coats of CWF. If it looks good, I paint. If it doesn't, then I sand it off and put on more applications of CWF. It's an inconvenient truth that paint does not cover, it colors. In fact sometimes it makes mistakes stand out. Thus, my techinque.
Other than this I am considering abandoning using primer on wood and paper (even with glassine) unless someone can come up with some good reason(s) to use it one these materials.