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Original Post (Thread Starter)
#879045 04/30/2022 2:53 AM
by tiger_cub
I have painted my Triumph rear engine plates 3 times now and keep getting a wrinkled finish. I have used exactly the same primer and top coat on the oil tank and got a great finish, just can't understand what isn't compatible with what. Everything was cleaned, one engine plate was chromed, one was original paint but both come out the same. The only difference I can see is it has got a bit colder, but its still above 20 degrees C. Any ideas?
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#879160 May 1st a 02:11 AM
by R Moulding
R Moulding
The problem you have been having is caused by too many heavy coats without enough time to dry between coats. Essentially you are trapping thinner under each coat when it should have evaporated. After while so much builds up that it attacks the paint and causes it to wrinkle.

Try holding your can further away from the piece and applying much lighter coats.
2 members like this
#879053 Apr 30th a 06:08 AM
by Mark Z
Mark Z
I was having that problem after applying a second coat of some enamel spray paint. The problem was, I was not allowing enough curing time for the first coat, and the second coat was lifting the first coat. The humidity was a bit high, which probably lengthened the required curing time. This was on bare, clean metal.

Read the can carefully, and perhaps try a different brand of paint. Some say to recoat within a couple of minutes or after 48 hours, some say recoat any time within the first hour, and some say to wait one day instead of two days.
1 member likes this
#881471 May 25th a 08:30 AM
by R Moulding
R Moulding
I would go along with Tridentman but also swap the primer for a 1k epoxy. This should completely seal of the bare steel.
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#881441 May 24th a 11:47 PM
by Tridentman
A couple of years ago I bought a "Dave Hills" center stand for my newly acquired Vincent Rapide. (Now unfortunately it is Dave Hills RIP).
The change involved changing the rear engine plates---- the new ones were supplied as part of the kit.
The engine plates and stand were supplied unpainted.
I degreased the components applied a phosphoric acid solution and everything looked good.
I then applied a coat of POR-15.
The stand looked fine but the engine plates went all wrinkled.
I removed the paint from the plates, degreased and repainted.
Same wrinkled result.
I decided that the problem was that the plate had been contaminated by oil used in the rolling process which had been rolled deep into the surface of the plate.
Part of the reason I came to that conclusion was that the flat faces of the plate were wrinkled whereas the paint finish on the edges of the plates was fine.
So I removed the paint from the plates (again) and then sanded them down with coarse then fine emery paper.
Repeated the painting process and the paint finish was fine.
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