Okey Dokey, let's kick this thing up again. Life's been hectic but I've been making progress and actually finished (almost) a project so that will be our Top story of the night.
Click to view attachment Now, I know about the body schutz treatment to restore the texture of the targa top, but after I saw
McMark's method using gelcoat, I though, "hey, that looks like a lot more work. I think I'll do that!" Okay, there's more to it. No offense to those who use body schutz. I'm sure it looks fine, but that strikes me more as creating a faux finish than a faithful restoration of the top. So... I set about learning
how to spray gelcoat. But first, I had to prep the top with a thorough scrubbing with Dawn dish soap followed by 2-3 wipe downs with dewaxer and silicone remover. Then I broke out the DA.
Click to view attachment After sanding, I filled a few hairline cracks around the edges with 2K glazing compound. If there was larger damage, I would have used reinforced filler but I think I'll be fine. Here it is ready for gelcoat and here's my kit:
Click to view attachment It includes the gelcoat, MEKP hardener, 2K urethane reducer left over from painting the car (MEK can be used as reducer but several forums said urethane reducer was better), wax additive for the final coat (that seals the coat from air so it cures hard), and acetone for cleanup. Mark mention flattening agent in his post but couldn't remember what he used when I asked. All I could find online was hella expensive and I could find no info on mix ratios. My local auto paint shop just gave me a blank stare when I asked. Forums said you could use talcum powder so I gave it a try. Testing was done WITHOUT hardener so I didn't waste anymore product than necessary and easier cleanup. Three things I needed to experiment with; sheen, thinning, and texture. For the spray gun, I drilled out my cheap HF gun to 2.0mm
following this vid. It worked great but when I sprayed my first test on cardboard, I wasn't getting the size of droplets I wanted and it was spraying on too smooth. I decided to try drilling out the gun just a little more. That was the perfect solution.... for ruining the gun
Yes, there is a limit to how big you can go. I was about to run into town to buy another cheap gun when I remembered my old ancient pressure pot gun that had gathered dust for 35 years. Why buy a new gun when I could ruin another? I stuck to the 2mm size this time and it worked. I still wasn't getting the texture I wanted on the cardboard. Turned out the problem was the cardboard that soaks up the gelcoat and flattens it out. The secret to the texture was to have the pressure as low as you can go and still push the mix out the nozzle, and hold the gun back farther than normal.
I experimented with a couple mixes with talcum powder to flatten the sheen but in the end, the sheen straight out of the can looked closest to the original. Just to be sure, I mixed a couple slugs with hardener to test if it hardened with the same sheen. Unflattened is on the left.
Click to view attachment I sprayed two coats thinned about 10% to get base cover and then quit for the day because too many bugs were landing in the wet gelcoat. Better to spray in the morning when it was too cool for most of them. After calling it quits, the wife caught me napping.
Click to view attachment Next morning I finished the spray and let it bake in the sun for the afternoon. Again, the final coat got wax added to seal out oxygen which inhibits hardening. I thinned the texture coats about 8% but should have stuck with 10. When the gun spit big drops, they didn't flatten out and had to be sanded off after things had set. I started with very light sanding with 400 and worked to 1500.
Overall, I'm happy with the texture. I think it is just a little tighter than the original but I think most people would have to see it side-by-side with another top to notice. Be my guest, but I'll call you a dick
Click to view attachmentI think I'm going to do just a bit more block sanding to knock those big drops down a little more. They stand a little proud of the rest of the surface enough you can feel them and they catch the light. Other than that, I'm pretty happy.
Click to view attachment I think this is a better way to restore the top than body schutz and also happens to be cheaper if you use Wurth, and especially if you have to buy a schutz gun. Would I do it again? Probably not. The reason is because now that I've spray Upol Raptor and gelcoat in different applications, I can tell you that the surfaces are indistinguishable in terms of hardness and feel. I think you have more control over the texture with the Raptor gun also. I'm pretty positive you could get the exact same result spraying Raptor but the Raptor is easier and about the same cost. I think it would be the best of both worlds. The ease of schutz with the finish of gelcoat.
Next installment will be refurbishing the other side of the top. It's done... almost. I'm just too tired to post tonight.