Hi, hope to get some advice .
I have blush in my epoxy fill coat ? Or what?
I did the coat in the evening and left, the temperature dropped and it started to rain over night. I used a local brand epoxy ( Ultra Clear Pro Surfacing Epoxy - haha).
When I came the other day, it looked as cloudy as it looks now,
the epoxy was hardend so I wrapped the board in a electric heating blanket to " postcure" it .
Surprinsingly some part of the blush went away with the temperature, two days later I took hot water with soap to wash the blush off.
After drying I sanded the coating as much as possible down, and it looked semi-ok.
I had ordered RR Kwik kick after the fail for the next step and was waiting till arrival.
When I went back to the board today the coat looks as blushish as pre- sanding.
So …
Can I assume the resin has yet not really hardend ?
How do I proceed ?
Just wash?- there’s no real margin for sanding anymore.
And Kwik kick- I didn’t find any dedicated advice for using Add F with Kwik Kick- I would definitely like to use Add F, the weather is still shitty , raining all the time , high moisture but would be great if I could finish the board end of the week.
I don’t care about the look, just want the next coat to stick.
Any help highly appreciated!
Thanks!
My initial treatment was done like this manual suggests.
So I will wash it again just prior the next coat to avoid more blushing?
Blush is a reaction of hardener with air humidity. It’s a white oily semi solid component that dispers in fluid giving a cloudy effect to clear resin. Blushed resin have en oily touch that clog dry sand paper. Let cure some days more (or cook in an oven) and it turn to a white powder over surface easier to whipe out. Otherwise the go to to pull out blush is to water sand thorougly then rinse with clean water. 30 years ago we have to do it each resin batch. Now with modern hardener far less problems. Add F use paraffine that float over surface while resin take avoid free hardener contact with air around. You can use paraffine styren if you don’t have add F. It’s used with poly resin same way.
I did that yesterday night ,scrubbing with hotwater, then sanding with wet sandpaper. I hope the next coat will stick, it’s now RR with add F.
The whitening of the resin in the pics is not just a layer , it’s deep inside, what could that be? The resin was clear when applied and turned white in most places.
Sometimes i had white cloudy in resin when i overwork it because i am low in quantity so i scrap it more than needed that introduce microbubbles that never go out because i use fast resin. It’s visible when lam on dark surface. Now i prep enough resin an lam with minimal squegge scrap.