will vinyl stick to painted ply board?

[Robert Lambie]

has the board been sanded down, then given a good gloss coat?

[daniel day]

Hi Robert

Yes its pretty smooth

[Robert Lambie]

if its smooth and a decent "gloss" coat. there shouldnt be any issues… none i can think of off hand anyway… mactac 3-5 and 5-7 year range would be perfectly fine to use.

are you fitting the vinyl wet or dry?

[daniel day]

fitted dry, it seems to stick for a while and then starts to peel

[Peter Normington]

sounds odd Daniel, what if anything are you using to prep the board before applying the vinyl?

Peter

[Jill Marie Welsh]

You say you have used both water and oil paint.
Are you referring to Latex paint?
I can never get vinyl to stick to this well, even with a dry application.
Especially with MacTac.
You might try heating it with a hair dryer and burnishing with a felt squeegee.
But I doubt it will help.

I would remove the vinyl, clean and sand the board, and paint it with 1-Shot lettering enamel. Wait two days, then try Oracal 751 applied dry.
You could probably varnish over this with 1-Shot speed dry UV clear to insure adhesion, but it’s not usually necessary.
Love….Jill

[daniel day]

Hi Peter

i seal it with a primer/ undercoat

[daniel day]

hi jill
thanks for that, its worth a try

[David Rogers]

Now – importantly, is it VARNISH or clear polyurethane (PU)?

Not much sticks to real varnish…and you can unfortunately get some PU clear coats that contain such oddities as Teflon (non-stick).

I’d normally just apply straight to the paint. And it probably work best with a non-‘trade’ (often a lower oil content for domestic market) type & (although it’s not required) I’ve known it to be clear coated in yacht varnish (PU) for a pick-proof & even gloss finish.

What IS required though for best adhesion is a flat surface without the grain being prominent…or it’s out with the heat gun & dabbing the softened vinyl into the grain!

Dave

[daniel day]

Thanks dave i will try without the varnish

[Neil Davey]

Best way to coat plywood is:-

1. 2 coats of oil based primer.
2. 2 coats of oil based undercoat.
3. 2 coats of top coat gloss finish.

Sand down between each coat starting with 120 grit then 180 and finally 240 grit and thin the first coat of primer about 20% with white spirit.

Paint using a 4" wool roller and switch to a foam roller for the top gloss coats.

I wouldn’t bother with varnish as this yellows after 18 months to 2 years and DO NOT use polyurethane varnish outdoors.

I use 1 Shot Sign Restoring clear and have never had any issues.

If you follow this procedure you should never have any adhesion problems.

Hope this helps.

Neil

[daniel day]

Thanks Dave I will give it a go