It said it's self sealing so the first coat is the sealer coat but that first coat I sprayed was nasty. It's valspar valguardWhat is the brand of varnish are you using and what did you seal it with? I used Target 9300 once with no CL100 and had perfect results, when I added CL100 I had results very similar to what you have.
I don't think there was contamination. I strained the coating and also tack clothed the piece immediately before sprayingIt looks like it may be contamination,either air borne, in the varnish or the dust wasn't removed from the surface properly. Have had no experience with Valspar but if you plan on doing work like this I would look into Target Coatings, excellent products with reasonable prices. My personal experience has been very good with all products I've tried except the 1000, I would stay with shellac base sealers such as Seal Coat or make your own from flakes.
You could use micro fiber but when possible I like to hose it off with compressed air.First of all never use a tack cloth when spraying anything other than oil base coatings.
Bubbles occur when you spray it to heavy or have airflow over the coating while it is drying.
Are you spraying Sapele'?
Yep, looks like floaters to me as well.Looks more like crap in the finish than bubbles. But if that's a seal coat it looks like it is very thick.
Most CV's have a wet and dry mil limit. The thickness usually shouldn't be 5 mil wet and total film thickness of 5 mil dry. But it varies by manufacturer. Waterborne are usually limited to 2-3 mil wet.
I'm not a pro like Leo.... but I totally agree on ditching the tack cloth. Tack cloths generally contain wax. The wax is what grabs the dust, but residue is always left behind and interferes with the finish.We've tried skipping the tack step. Finish is usually rougher than we want when we skip it.
Yep, looks like floaters to me as well.
Our cleaning process is to blow everything off with compressed air, followed by a tacking with denatured alcohol. We use surgical drapes to tack with because they don't shed.
I quoted my other post in this thread. We don't use store bought tack clothes.I'm not a pro like Leo.... but I totally agree on ditching the tack cloth. Tack cloths generally contain wax. The wax is what grabs the dust, but residue is always left behind and interferes with the finish.
If you're going to use tack, then do another cleaning with denatured alcohol to get rid of the wax residue.
Just my $0.02, YMMV, JMPOV, IMHO and all that. :whistling