hammer408 said:
Working on my Fiberglass tips for my 9A and I purchased some Super-Fil for finishing work.......No instructions came with the Super-Fil and I'm wondering if I can apply it directly to the sanded portion of the fiberglass parts? ( I used epoxy system from West)....or does the fiberglass need primed first before I add the Super-fil???
That brings up a second question: what type of primer can I use on these parts? I will be painting them with Valspar Sunthane 2K polyurethane as the finish coat.
Any help appreciated.
Thanks
Henry
Finishing Kit
N918HB
If we are talking about the super-fil that is blue and white and is mixed 1:2 (I think). It's a pre-mixed micro epoxy. So, yes, you can apply it over the top of sanded fiberglass (also done with epoxy). It's not very cheap stuff tho, and per it's weight, microballons and epoxy is probably a better choice.
Microballons in West mix up really good, and you want it really dry (meaning it doesn't "gloss" when you quit stirring it, and it will hold the peak, when stirred and you pull out the stirring stick).
I'd then wipe a little mixed raw epoxy on the surface with a rag or paper towel. You don't need a layer, just wet it out, but don't leave much epoxy. Then apply the Micro.
Also, the trick to get Micro smooth is to take a putty knive (width dependant upon usage) and heat it till it's hot with a heat gun (heat shrink tubing gun, or paint stripper gun). Then trowel the micro into the form you want it. You'll have to work fairly quickly and you'll only get a couple of passes with the putty knife before it cools. The heat will also kick off the epoxy, but it's so much nicer to work with. The knife will smooth it just like butter when heated.
As for primer, either epoxy or urethane will work just fine over super-fil or epoxy/micro. I use PPG K38, but there are lots of different primer/surfacers that can be used.
Hope this helps,