You could use the feast Watson black stain, which is almost opaque and would hide the joints, and then use the finish of choice over the top of this and the front. The stain is an alcohol stain so should completely dry off leaving no problem residue.
Black Japan is slightly more see through so you would see some timber finish, but would still hide the filler I'd have thought.
Great looking guitar so far, well done!
Some decisions made and a little more movement, leading to yet another question.
Sides and neck Painted black (oil based enamel) 1,500 grit wet sanded back, now smooth but dull finish.
Do I spray poly over smooth dull black finish hoping for a nice deep black shine result?
Or do I apply another shiny coat of black then without sanding apply the poly?
The back will also be painted before poly (colour TBA).
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The vegemite sandwich look. I like it and you have done a great job on the neck heel mod.
# 1 - EX-5 https://goo.gl/fQJMqh
# 2 - EX-1 https://goo.gl/KSY9W9
# 3 - Non PBG Tele https://goo.gl/W14G5g
# 4 - Non PBG J Bass https://goo.gl/FbBaFy
# 5 - TL-1AR GOTM Aug 2017 https://goo.gl/sUh14s
# 6 - MMB-4 Runner-up GOTM Oct 2018https://goo.gl/gvrPkp
# 7 - ES-1 Runner-up GOTM Aug 2018https://goo.gl/T9BEY8
Never spray or paint any gloss finish without sanding dull inbetween coats as the new layer will have nothing to grip to and will eventually delaminate. If the black has had enough coats and is nice and solid then yes spray poly straight on but ALWAYS DO SAMPLE TESTS FIRST on scraps if possible not the guitar.
Fender electric Fat Strat mim. (Bought)
Maton Electric Acoustic EM325C
Pitbull Guitars ST-1 ( finished) http://www.buildyourownguitar.com.au...ead.php?t=5970
Pitbull Guitars SG-2 ( Finished) http://www.buildyourownguitar.com.au...ead.php?t=6124
Pitbull Guitars JM-1 (Finished. 2018 June GOTM))http://www.buildyourownguitar.com.au...ead.php?t=7150
Pitbull Guitars TL-1 (In production) [url]https://www.buildyourownguitar.com.au/forum/showthread.php?t=8676
Thanks for that advice.
The job can now move forward :-)
Actually it's been taking two steps forward and one backward etc for the last few days. I've had an "Oh sh*t" but correcting measures are in hand. I'll post about such this week once it's all under control.