' Hi Brian,

Is that Fumed Silica? It is very fine, extremely fluffy material. But I don't think it's a good filler that sands easily. I don't think it will do the job on the finish that you are looking for but I don't know for certain. I would test first.

I don't use microballoons in the finish either. Much too coarse and needs extra filling so paint can stick without pinholes or bubbles. I don't recommend it as a top coat. Great underlayment tho.

So that we are not accused of highjacking this thread, maybe we should this take this discussion to your other thread?? What do you think? '
( Quote from the 'post some pictures' thread.)

Matt,
Good thinking
http://www.westsystem.com/ss/410-microlight
I can't find a data sheet or spec.
I think it's a synthetic 'balloon' a bit like the brick red phenol ones but this is easy to sand according to a friend ,Dave, who is helping when he has time.
On a test piece just now it, mixed 50/50 with a dope thinner 50/50 mix, it has filled 0.3oz veil all but completely in one coat.
There are pin holes/air bubbles in it alright - very small though.
I'm thinking that if I thin the dope more and use less 410 that it will fill in layers and I can start to add talk progressively in layer 2 and 3.
I will do samples first.

Brian