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Primer/Sealer for expanded poly board
6 replies to this topic
Posted 10 February 2009 - 01:21 AM
I have just finished sanding my second Expanded Polyurethane blank, and now need to seal/prime it with something. I tried propionate on another blank, and it just melted it -I know Vince uses ETex, is anyone using anything a bit less time consuming and less TACKY, the small pieces take some holding for drying etc, and thought there may be a spray on sealer, it needs to have a pretty good solids content to fill all the small air holes. pete
Posted 10 February 2009 - 01:36 AM
Investigate 2K car finish (clearcoat). I use it on baits over cellulose paints and it does not affect the finish. I cannot be sure whether it would be suitable or not but worth digging around a bit.
Posted 10 February 2009 - 02:21 AM
You might try high build auto lacquer primer straight from the can for dipping. Which one dip should fill any voids or you spray it on with a fast drying thinner. Preferably with a gun (detail gun) that can pattern a larger volume of primer than a airbrush.
Posted 10 February 2009 - 03:27 AM
Thanks Phil/Dan, I dipped one in Prop which was thinners based, and it softened the expanded poly, the lip slot opened up and looked like it was laughing at me. I will try spraying it, with some primer, I think I have some grey stuff stashed in the shed somewhere.pete
Posted 10 February 2009 - 03:50 AM
Yes, there is that possibility of solvent saturating the foam with dipping. But straight (no prior thinning) from the can most likely will have less solvent than the prop mix. I am confident you will work it out one way or the other. There are plenty of two part primers on the market that would do the job, but are going to cost more and not as easy to use as lacquer primer.
Edited by KcDano, 10 February 2009 - 03:52 AM.
Posted 10 February 2009 - 06:40 AM
Thanks again Dan, and yes come to think of it, the prop was a pretty thin mix, so I will get some scrap and try with a thicker brew and also try this grey primer/filler I found, and see what happens????Pete
Posted 10 February 2009 - 10:43 AM
The polyurethane itself is waterproof, so it sounds to me like all you need is something to smooth the outside, and get it ready for paint.
If the prop is melting your lure, couldn't you just use a soft brush, and the straight prop solvent, and brush it onto the outside of the lure lightly to smooth it?
If it melts slightly, it should fill the holes and blend everything together, and it would probably dry really fast.
Just a thought. If it doesn't help, give it back. I don't have any to spare!