I'm currently making a buck to make a mould for a diffuser. Based around a wooden construction with a fibre board to get a good curve. I am wondering what a good sealer for this would be.

Hi, Tango.

I use polyester filler (2k) and it never disappointed me. It builds thickness fast, can be shot with a "standard" spray gun (I have a 30euros  1.4 mm tip gun and thats enough) and polishes to a very very decent gloss.

I reduce it with acetone, or else it's too thick for my 1.4mm tip. It works pretty good. By using acetone, you can still build a good thick coat, but I would suggest in that case that you apply two lighter coats (that would still be thicker than regular paint) to allow acetone to evapore. From my experience, working in "high temp" room, like 25°C, would allow acetone to evapore (part would turn to mat color rather than its glossy state when you spray it) in like 12-13 mins, so you would skip a few gun cleanings, and then spray all your coats in one operation. I usually prepare a new batch of filler while the part is curing.

Dont be tempted by rattle can fillers, It could react with heat or chemicals. I had those troubles, so did a friend of mine, and with a different brand.

In any case, remember to wear a respirator, this stuff is not cool to your body.

I hope it helped.

 



 


    A $1000 electronic device will always protect a 10 cents fuse