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@Polka_Dot
After the final coating of PVA the helmet was ready for use if only used in the dry. The fit was such that it stayed in place very well without any straps. However I wanted to do as complete a job of it as I could. It should be usable in inclement weather as well as fair, so it would need sealing. It had crossed my mind to put just a lacquer over it to seal it and still show off its paper construction, but I decided that it was unusual enough and I wanted to see just what level of finish I could achieve. I would paint it and leave the inside sealed but unpainted.
The painting stage of the project was by far the longest. Not having any proper studio/workshop/shed to work in and to leave my work I had to do all the spraying outside, in front of the house where I live. This meant I always had to wait for the right conditions (adequate daylight, very little or no wind, no rain). This was quite tiresome.
When I was shopping for paint a surprisingly helpful lady recommended that, considering the material I wanted to paint onto, I use plastic primer.