I have done a beautiful hot coat. Shiny, non tacky, no weird stripes fron the brush, nothing.
So I go for it, very agressive sand paper (60 grit) on the sander and it kind of stays shiny. Like I am polishing it.
I tried different speeds on the sander.
It seems to get back from opaque to shine state after I pass over it.
Maybe too much wax in the resin?
I used 12 ml of wax in styrene in 400 gr of poly resin. 8 ml of mekp. I added two drops of cobalt, because it was a bit cold (16 celsius, 60 fahrenheit)
It starded to set at aprox 10/12 min.
Sand paper does not clog with wax, like some other times I added too much.
Try 80/120 grit high quality sandpaper sometimes higher grit work better for this purpose.
40/60 grit work well if you want to flatten a textured surface because it have something to cut here and there: all material over the main level. Because your coat is near “perfect” there is nothing over to cut so your 60 grit have to cut everywhere, it’s long, need lot of power produce too much heat for nothing good except deep scratches. Finaly in this situation you will probably find that a higher grit scratch fine everywhere like you want far easily.
I work with epoxy resin so maybe its a bit different, but when this happens to me I sttart off with wet sanding with a finer grit to take the shine off, then work my way up through thr grits to get to the one I want.
Cobalt and too much wax. I don’t know why people have trouble with the amount of wax in a hotcoat. For years I have dumped no more than a cap full off of a four oz. can. About a teaspoon in a quart or less of resin. Not very accurate huh? Should be satin or egg shell, not shiny.
Oss1, yeah. I always worked that way. Just eyeballing everything. I wanted to start taking things a bit more serius, and I even took notes on amounts and proportions.
Yeah I don’t know about %, but 3–5 seems like more than I use in a quart. A quart usually gets one side of a longboard for me. 15cc of MEK in a quart. Even 20cc is OK if you are fast enough and I am.
