Hi guys,
I am currently 'finishing'? my first project - an old Strat 'style' guitar that my girlfriend bought for £10 years ago and then abandoned in the attic.
It apeared someone had tried refurbishing it previously, probably hand painting it! and the gig bag it was in had become one with the body
Anyway, I managed to remove the gig bag, stripped off the naff paint job, sanded the wood smooth, sealed with epoxy resin, sanded smooth again, sprayed with primer and then 4 coats of gorgeous purple metalic (from rattle cans admittedly, but I was very happy with the results at this point).
The only thing was that although the paint was supposedly quick drying (it was dry to the touch within 10 minutes) it then seamed to take an age to harden, and I didn't want to start with the clear coats incase I built up too thick a coating of soft paint that never hardens.
After 3 days, if I pressed firmly I could leave finger prints which dissapearded when pollished with a soft cloth. After 5 days it no-longer left finger prints but I could leave marks with a finger nail.
By now I was itching to get the job finished, as I hope to give the guitar back to my girlfriend for X-mas, looking like new.
So I then moved on to the clear coat. The only clear I could find in rattle cans (I don't have a spray rig, but I'm hoping to get one for my next project - a complete build from scratch) was Clear Acrylic. I sprayed a couple of coats then left it to dry, not wanting to build up too many soft coats again.
I then found this site and read a lot of the great tutorials and tips you give in your posts.
It seams that 'Laquer' or poly-urathane are the prefured clear coats, (I always thought Acrylic was a laquer BTW) and I have read that Acrylic is not that durable?
Sorry for the long post but my questions are these:
1, Have I made a bad move by using Acrylic? Will it never harden to the same sort of finish as you get on a commercial guitar?
2, What is the reason behind sanding back between coats? is it just to correct any imperfections such as dust or orange peel surface? The reason I ask is that I have now sprayed 4 coats of clear and at this point it's sugested I should sand back before spraying another 5 or so then sanding again before a final coat then polishing, but at this stage I'm quite happy with the smoothness of the finish (its almost like glass, just a little soft and could do with being thicker/deeper). Is there any need to sand or can I carry on building up the thickness?
3, If I have to sand back, am I best to wait until it has realy hardened each time? (if it ever does?)
4, I know that when re-spraying a car/body panels, many spray-shops bake the paint job in an oven. I have access to an industrial drying oven at work. Has anyone used or would you recommend using a drying oven? Would this harden clear acrylic as hard as a commercial finish? or would it cause cracking or other detrimental effects? If so, at what sort of temperature?
Finally, I read in one tutorial that when applying clear coats you should spray a coat then wait around 20 minutes or so then add the next coat while the first is still tacky? and that you shouldn't leave it too long between coats. Due to only having short periods of time free I've done a couple of coats 30 minutes apart then left it untill the next day (24s hour or so) before doing the next couple of coats. Is this going to cause any problems?
Sorry again for the length of this post, Hope someone manages to plough through it and can help.
Regards,
Matt.