How not to use Chip Guard

[gray]

Ok,
After much searching around, in person and on the net, I bought some SEM clear Chip Guard to use on my front bumper; idea was to prevent chipping from stones. I then cleaned off my bumper center section (80) very well with the proper prep cleaner, 5 times at least; and got to spraying. It was looking real good, used almost the entire can; real good, feels good, tastes good ---- you know the rest of the drill.

After it is all done and after waiting, I pull the masking tape up; and the Chip Guard comes right up with the tape; not all of it, but about an inch of it, enough to ruin the job.

Only good thing is that the Chip Guard all peeled right off like a few days after you get a bad sunburn. I just brushed it with a handful of paper towels, rolled right off.

My take on it is that you may not be able to use tape ie: the entire piece needs to be coated, or wait longer before pulling it up.

I think I'll give up on the idea of using Chip Guard, and instead, just use multiple coats of paint and clear coat, ie: the old fashioned way.

Might call the company to find out what went wrong, how long to wait to pull the tape, not use tape, etc,etc.

[Wile E Coyote]

Don't have much to add, except you did use 3837 Sem-Solv for prep, sanded with 400 grit, and it wasn't 25 deg. out when you sprayed, right? Were you topcoating rattlecan paint, automotive paint, or powdercoat or what? You def. got poor adhesion and then some.

[jsaltlick]

X2 Prolly needs something to grip to like a scuffed surface

[gray]

Did prep properly, but did not scuff the surface. I had that same thought, but the can says you can spray it over automotive finishes, in fact recommends that versus painting over it, and it is their clear product, which is supposed to be used when you want to keep the original color. They do make a black that is used more for underneath a final coat. It was starting to cool off for the evening; I would guess however that the metal was still warm, around 65 degrees. I guessing a bit of all of the above; I may have pulled the tape too soon, was concerned that it would not come up later. It was immediately apparent that there was zero adhesion when I pulled the tape up. I'll probably just paint it with multiple layers of a hard paint; like Dupli-Color's Wheel paint; that is what I used for the plastic end caps which came out very well. I used the wheel clear coat over them also. Time will tell.

[Wile E Coyote]

Not scuffing was your downfall. The SEM TDS ( tech data sheet) on the chip guard states to sand w/ 400 grit.
Very hard paint on a flexible part like plastic? Not sure how that'll hold up, especially in cold weather. Don't bump anything.


Anything else ya wanna have me/us pick at you about?

[Project60]

Tape didn't ruin the job. We do adhesion checks on coatings with tape - i.e. scratch the surface, lay down tape and pull the tape (coatings come up with the tape when there is adhesion loss).

[Radd Cruisers]

Yep, 3m scotch bright the surface until dull, good tooth for the SEM.