Teardrops n Tiny Travel Trailers

Does anyone have any experience with Evercoat 27 for general filling in wood (small cracks, screwholes, etc.)? My weekender is all plywood exterior and I plan to paint it. After sanding, I planned to seal with CPES, fill with Fill-it, and fiberglass all the edges before painting. Thought I had everything ordered, but Jamestown Distributors forgot to tell me that the Fill-it was on backorder and wouldn't be available for two weeks (big thumbs down on their feedback survey). I can get Evercoat 27 from a local marine supply company and it looks pretty good for what I need, but I'm not sure about its compatibility with CPES and which one to do first. The only thing negative that I can find online is the fact that it sets up quickly and has to be worked in very small batches.

Evercoat Formula 27 will be completely compatible with fully cured CPES. That being said, the CPES should be done first. Formula 27 is nothing more than glorified body filler, and as such is fairly easy to use if you have any experience with body fillers on automobiles, or spackling walls.